Updated on 2025/12/26

写真a

 
Nakagawa Tomoko
 
Organization
- - Professor
External link

Degree

  • Ph. D. ( 1990.3   The University of Tokyo )

  • Master of Science ( Tohoku University )

Licenses and Qualifications

  • 高等学校(理科)専修免許

    Classification of license or qualification:license 

    Category of license or qualification:Faculty 

Current State of Research and Teaching Activities

  • 大学院生の修士論文は必ず学会発表させ、またできる限り学術論文として出版する。

Research Interests

  • GEOTAIL

  • 太陽風加速

  • ようこう

  • 磁気流体波

  • 太陽風

  • 惑星間空間

  • さきがけ

  • 平面状磁場構造

  • プラズマ

  • Interplanetary plasma physics

  • かぐや衛星

  • Coronal Mass Ejection

  • 反射プロトン

  • 地磁気変動

  • 太陽物理

  • 磁気圏物理

  • 惑星間空間プラズマ

  • 惑星間空間磁場

  • Solar wind

  • Solar physics

  • Magnetospheric plasma physics

  • 非スパイラル磁場

  • フラックスロープ

  • 月ウェイク

  • 磁気ロープ

  • 多点衛星観測

  • 帯電

  • 接線型不連続

  • 宇宙天気予報

  • ARASE

Research Areas

  • Energy Engineering / Fundamental plasma

  • Natural Science / Space and planetary sciences

  • Natural Science / Astronomy

Subject of Research

  • 太陽風と非磁化天体との相互作用

    2003.4

  • 衛星帯電と光電子

    2000.4

  • 下部ELF帯地磁気変動の動態の観測

    1997.4

  • 太陽風と惑星磁気圏の相互作用の研究

    1990.4

  • 太陽風磁場の3次元構造の解析

    1985.4

  • 惑星間空間磁場観測の検定と較正、ノイズ分離

    1985.4

  • 太陽風とハレー彗星の相互作用

    1985.4 - 1987.3

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Education

  • The University of Tokyo

    1987.4 - 1990.3

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    Country/Region: Japan

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  • 東京大学大学院   理学系研究科   地球物理学専攻

    1987.4 - 1990.3

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    Country/Region: Japan

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  • 東北大学大学院   理学研究科   地球物理学専攻

    1985.4 - 1987.3

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  • Tohoku University

    1985.4 - 1987.3

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    Country/Region: Japan

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  • Tohoku University   Faculty of Science

    1981.4 - 1985.3

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    Country/Region: Japan

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Research History

  • Tohoku Institute of Technology   Faculty of Engineering Department of Information and Communication Engineering   Professor

    2009.4

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  • Tohoku Institute of Technology   Faculty of Engineering, Department of Information and Communication Engineering   Associate Professor

    2007.4 - 2009.3

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  • Tohoku Institute of Technology   Faculty of Engineering, Department of Information and Communication Engineering   Associate Professor

    2004.4 - 2007.3

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  • Tohoku Institute of Technology   Faculty of Engineering   Associate Professor (as old post name)

    1995.4 - 2004.3

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  • Tohoku Institute of Technology   Faculty of Engineering   Lecturer

    1993.4 - 1995.3

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  • Tohoku Institute of Technology   Department of Communication Engineering   Assistant Professor

    1992.5 - 1993.3

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    Country/Region:Japan

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  • 日本学術振興会   特別研究員

    1990.4 - 1992.3

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Professional Memberships

Committee Memberships

  • 地球電磁気・地球惑星圏学会   学生発表賞 審査委員  

    2023 - 2025   

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  • URSI   URSI GASS 2023 Session H04 convener  

    2022.11 - 2023.8   

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    Committee type:Academic society

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  • URSI   URSI AT-AP-RASC2022 Session H03 convenor  

    2021.11 - 2022.7   

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    Committee type:Academic society

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  • 日本学術振興会   特別研究員等審査会専門委員及び国際事業委員会書面審査員・書面評価員  

    2021.7 - 2022.6   

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    Committee type:Academic society

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  • Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS)   Councilor  

    2021   

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    Committee type:Academic society

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  • 日本学術振興会   特別研究員等審査会専門委員及び国際事業委員会書面審査員・書面評価員  

    2020.7 - 2021.6   

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    Committee type:Academic society

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  • URSI   URSI GASS 2020/2021 Session H08 convener  

    2019.10 - 2021.9   

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    Committee type:Academic society

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  • 日本学術振興会   2020年度科学研究費委員会 審査・評価第二部会B小委員会2 基盤研究(S)  

    2019.1 - 2019.12   

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    Committee type:Academic society

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  • 地球電磁気・地球惑星圏学会   学生発表賞 審査委員  

    2019   

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  • 日本学術振興会   平成31(2019)年度科学研究費委員会 審査・評価第二部会B小委員会  

    2018.12 - 2019.11   

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  • 地球電磁気・地球惑星圏学会   フロンティア賞 推薦委員会委員  

    2018.1 - 2021.10   

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    Committee type:Academic society

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  • 日本学術振興会   平成31(2019)年度科学研究費委員会 審査・評価第二部会B小委員会3 基盤研究(S)  

    2018.1 - 2018.12   

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    Committee type:Academic society

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  • 地球電磁気・地球惑星圏学会   学生発表賞 審査委員  

    2018 - 2019   

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  •   平成30(2018)年度科学研究費委員会 審査・評価第二部会B小委員会  

    2017.12 - 2018.11   

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  •   科学研究費委員会委員平成29年度 挑戦的研究部会第17小委員会  

    2016.12 - 2017.11   

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  • 名古屋大学宇宙地球環境研究所   共同利用・共同研究委員会委員(太陽圏宇宙線専門委員会)  

    2015.11   

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    Committee type:Other

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  • 日本高等教育評価機構(JIHEE)   評価員  

    2014.6 - 2015.4   

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  • 地球電磁気・地球惑星圏学会   大林奨励賞候補者推薦委員会委員長  

    2013.11 - 2015.11   

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  • 地球電磁気・地球惑星圏学会   大林奨励賞候補者推薦委員会委員  

    2011.11 - 2013.11   

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  • 名古屋大学太陽地球環境研究所   共同利用委員  

    2010.4 - 2012.3   

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    Committee type:Other

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  • 名古屋大学太陽地球環境研究所   太陽圏専門委員 委員長  

    2010.4 - 2012.3   

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  • 名古屋大学太陽地球環境研究所   「地上ネットワーク観測大型共同研究 (重点研究)」審査員  

    2010.4 - 2011.3   

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  •   科学研究費委員会専門委員 (平成21年度 第1段審査委員)  

    2008.12 - 2009.11   

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  • 地球電磁気・地球惑星圏学会   波動分科会ワーキンググループ  

    2008   

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  •   科学研究費委員会専門委員 (平成19年度 第1段審査委員)  

    2006.12 - 2007.11   

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  • 名古屋大学太陽地球環境研究所   共同利用委員  

    2006.4 - 2008.3   

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    Committee type:Other

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  • 日本学術会議   電気電子工学委員会/URSI分科会プラズマ波動小委員会委員  

    2006 - 2014.9   

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    Committee type:Academic society

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  • American Geophysics Union   Associate editor of JGR-Space Physics  

    2006 - 2007   

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    Committee type:Academic society

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  •   科学研究費委員会専門委員 (平成18年度 第1段審査委員)  

    2005.12 - 2006.11   

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  • 宇宙航空開発研究機構宇宙科学研究所   プロジェクト研究員(GEOTAILプロジェクト、あけぼのプロジェクト、BepiColomboプロジェクト)  

    2005   

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  • 地球電磁気・地球惑星圏学会   学生発表賞 審査委員  

    2005   

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  • 日本学術会議   電波科学研究連絡委員会H分科会委員  

    2004 - 2007   

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    Committee type:Academic society

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  •   科学研究費委員会専門委員 (平成16年度 第1段審査委員  

    2004   

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  • 地球電磁気・地球惑星圏学会   学生発表賞 審査委員  

    2004   

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  •   科学研究費委員会専門委員 (平成15年度 第1段審査委員)  

    2003   

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  • 名古屋大学太陽地球環境研究所   太陽圏専門委員  

    2002 - 2015.11   

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Job Achievement

  • 女子進学機会均等WG

    2023.4

  • 人事委員会

    2020.4 - 2024.3

  • 大学院人事委員会

    2018.4 - 2024.3

  • 大学院通信工学専攻長

    2018.4 - 2020.3

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    専攻長

  • 退学者低減タスクフォース

    2016.4 - 2017.3

  • 大学施設設備構想検討委員会

    2013.4 - 2015.3

  • 建物の建替え計画策定WG

    2013.4 - 2015.3

  • ウェルネスセンター長

    2012.4 - 2014.3

  • 人事委員会

    2010.4 - 2014.3

  • 情報通信工学科オープンキャンパス担当

    2009.4 - 2025.3

  • 情報通信工学科入試広報委員会

    2009.4 - 2025.3

  • ウェルネスセンター運営委員会

    2006.4 - 2020.3

  • 大学施設設備構想検討委員会

    2006.4 - 2012.3

  • ハラスメント防止委員会

    2005.9 - 2020.3

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Papers

  • 人工衛星「あらせ」により観測された電場方向のずれの特性 Reviewed

    中川朋子,三好由純, 笠羽康正,笠原禎也,土屋史紀, 熊本篤志, 北原理弘, 中村紗都子, 松岡彩子

    東北工業大学紀要 理工学編・人文社会科学編   43   1 - 7   2023.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:東北工業大学  

    DOI: 10.51048/00000225

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  • An Effect of Photoelectrons from Spherical Double Probes on Electric Field Measurement from ARASE Satellite Reviewed

    Tomoko Nakagawa, Tomoaki Hori, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, And Ayako Matsuoka

    Memoirs of the Tohoku Institute of Technology   45   1 - 9   2025.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (bulletin of university, research institution)  

    DOI: 10.51048/0002000039

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  • Anticorrelation Between Sunspot Number and Spectral Resonance Structures of ELF Magnetic Variations Detected at Kawatabi, Miyagi, Japan Reviewed

    URSI Radio Science Letters   5   2024.4

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:International Union of Radio Science (URSI)  

    DOI: 10.46620/23-0035

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  • Sub-ion-gyro scale magnetic field compressions generated by the solar wind interaction with the moon Reviewed

    Tomoko Nakagawa, Futoshi Takahashi, Yoshifumi Saito, Hisayoshi Shimizu

    Earth, Planets and Space   75 ( 1 )   2023.12

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    DOI: 10.1186/s40623-023-01817-4

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  • Diffuse whistler mode waves detected by Kaguya in the lunar polar region Reviewed

    Nakagawa, T, Takahashi, F, Shimizu, H, Saito, Y

    Radio Science, 57,   57 ( 1 )   e2021RS007369   2022.1

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    DOI: 10.1029/2021RS007369

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  • Polarization Reversal of Low‐Frequency Magnetic Variation in the Lunar Wake Reviewed

    Tomoko Nakagawa, Futoshi Takahashi, Yoshifumi Saito, Hisayoshi Shimizu

    Journal of Geophysical Research: Space Physics   126 ( 8 )   2021.8

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union (AGU)  

    DOI: 10.1029/2021ja029299

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JA029299

  • The BepiColombo–Mio Magnetometer en Route to Mercury Reviewed

    W. Baumjohann, A. Matsuoka, Y. Narita, W. Magnes, D. Heyner, K.-H. Glassmeier, R. Nakamura, D. Fischer, F. Plaschke, M. Volwerk, T. L. Zhang, H.-U. Auster, I. Richter, A. Balogh, C. M. Carr, M. Dougherty, T. S. Horbury, H. Tsunakawa, M. Matsushima, M. Shinohara, H. Shibuya, T. Nakagawa, M. Hoshino, Y. Tanaka, B. J. Anderson, C. T. Russell, U. Motschmann, F. Takahashi, A. Fujimoto

    Space Science Reviews   216 ( 8 )   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    <title>Abstract</title>The fluxgate magnetometer MGF on board the Mio spacecraft of the BepiColombo mission is introduced with its science targets, instrument design, calibration report, and scientific expectations. The MGF instrument consists of two tri-axial fluxgate magnetometers. Both sensors are mounted on a 4.8-m long mast to measure the magnetic field around Mercury at distances from near surface (initial peri-center altitude is 590 km) to 6 planetary radii (11640 km). The two sensors of MGF are operated in a fully redundant way, each with its own electronics, data processing and power supply units. The MGF instrument samples the magnetic field at a rate of up to 128 Hz to reveal rapidly-evolving magnetospheric dynamics, among them magnetic reconnection causing substorm-like disturbances, field-aligned currents, and ultra-low-frequency waves. The high time resolution of MGF is also helpful to study solar wind processes (through measurements of the interplanetary magnetic field) in the inner heliosphere. The MGF instrument firmly corroborates measurements of its companion, the MPO magnetometer, by performing multi-point observations to determine the planetary internal field at higher multi-pole orders and to separate temporal fluctuations from spatial variations.

    DOI: 10.1007/s11214-020-00754-y

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    Other Link: http://link.springer.com/article/10.1007/s11214-020-00754-y/fulltext.html

  • Electromagnetic Ion Cyclotron Waves Detected by Kaguya and Geotail in the Earth's Magnetotail Reviewed

    Tomoko Nakagawa, Masaki N. Nishino, Hideo Tsunakawa, Futoshi Takahashi, Hidetoshi Shibuya, Hisayoshi Shimizu, Masaki Matsushima, Yoshifumi Saito

    Journal of Geophysical Research: Space Physics   123 ( 2 )   1146 - 1164   2018.2

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    DOI: 10.1002/2017JA024505

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  • Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results Reviewed

    Yasumasa Kasaba, Keigo Ishisaka, Yoshiya Kasahara, Tomohiko Imachi, Satoshi Yagitani, Hirotsugu Kojima, Shoya Matsuda, Masafumi Shoji, Satoshi Kurita, Tomoaki Hori, Atsuki Shinbori, Mariko Teramoto, Yoshizumi Miyoshi, Tomoko Nakagawa, Naoko Takahashi, Yukitoshi Nishimura, Ayako Matsuoka, Atsushi Kumamoto, Fuminori Tsuchiya, Reiko Nomura

    EARTH PLANETS AND SPACE   69   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-017-0760-x

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  • ULF/ELF Waves in Near-Moon Space Reviewed

    Tomoko Nakagawa

    Low-Frequency Waves in Space Plasmas   293 - 306   2016.2

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    Authorship:Lead author   Language:English   Publishing type:Part of collection (book)   Publisher:Wiley Blackwell  

    DOI: 10.1002/9781119055006.ch17

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  • ELF magnetic fluctuations detected by Kaguya in deepest lunar wake associated with type-II protons Reviewed

    Tomoko Nakagawa, Tatsuya Nakashima, Takuya Wada, Hideo Tsunakawa, Futoshi Takahashi, Hidetoshi Shibuya, Hisayoshi Shimizu, Masaki Matsushima, Yoshifumi Saito

    EARTH PLANETS AND SPACE   67 ( Apr )   2015.4

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    DOI: 10.1186/s40623-015-0196-0

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  • Ion entry into the wake behind a nonmagnetized obstacle in the solar wind: Two-dimensional particle-in-cell simulations Reviewed

    Tomoko Nakagawa

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   118 ( 5 )   1849 - 1860   2013.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1002/jgra.50129

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  • A Disturbance of the Ion Tail of Comet Halley and the Heliospheric Structure as Observed by Sakigake Reviewed

    Takao Saito, Kiyohumi Yumoto, Kunio Hirao, Keiji Saito, Tomoko Nakagawa, Edward J. Smith

    Comet Encounters   821   2013.3

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    Publisher:Wiley-Blackwell  

    DOI: 10.1029/sp027p0293

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  • Hydromagnetic Waves Near O + (OR H 2 O + ) Ion Cyclotron Frequency Observed by Sakigake at the Closest Approach to Comet Halley Reviewed

    Kiyohumi Yumoto, Takao Saito, Tomoko Nakagawa

    Comet Encounters   825   2013.3

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    Publisher:Wiley-Blackwell  

    DOI: 10.1029/sp027p0107

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  • Ion entry into the wake behind a nonmagnetized obstacle in the solar wind: Two-dimensional particle-in-cell simulations Reviewed

    Tomoko Nakagawa

    Journal of Geophysical Research: Space Physics   118 ( 5 )   1849 - 1860   2013

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Blackwell Publishing Ltd  

    DOI: 10.1002/jgra.50129

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  • Large-amplitude monochromatic ULF waves detected by Kaguya at the Moon Reviewed

    Tomoko Nakagawa, Akihito Nakayama, Futoshi Takahashi, Hideo Tsunakawa, Hidetoshi Shibuya, Hisayoshi Shimizu, Masaki Matsushima

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   117 ( A04101 )   2012.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2011JA017249

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  • Large-amplitude monochromatic ULF waves detected by Kaguya at the Moon Reviewed

    Tomoko Nakagawa, Akihito Nakayama, Futoshi Takahashi, Hideo Tsunakawa, Hidetoshi Shibuya, Hisayoshi Shimizu, Masaki Matsushima

    Journal of Geophysical Research: Space Physics   117 ( 4 )   2012

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Blackwell Publishing Ltd  

    DOI: 10.1029/2011JA017249

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  • Role of the solar wind magnetic field in the interaction of a non-magnetized body with the solar wind : An electromagnetic 2-D particle-in-cell simulation Reviewed

    NAKAGAWA Tomoko, KIMURA Shinya

    EPS   63 ( 6 )   477 - 486   2011.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science $\mathplus$ Business Media  

    DOI: 10.5047/eps.2011.02.006

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  • Generation mechanism of the 100-second magnetic field variations observed by Kaguya around the moon

    Memoirs of the Tohoku Institute of Technology. Ser.1, Science and engineering   ( 31 )   21 - 27   2011.3

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    Language:Japanese  

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  • Non-monochromatic whistler waves detected by Kaguya on the dayside surface of the moon Reviewed

    NAKAGAWA Tomoko, TAKAHASHI Futoshi, TSUNAKAWA Hideo, SHIBUYA Hidetoshi, SHIMIZU Hisayoshi, MATSUSHIMA Masaki

    EPS   63 ( 1 )   37 - 46   2011.1

  • Role of the surface charging in the solar wind interaction with a small, non-magnetized, electrically non-conducting body studied in a two-dimensional electromagnetic full particle simulation Reviewed

    Tomoko Nakagawa

    2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011   2011

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/URSIGASS.2011.6051095

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  • Fitting a toroidal force-free field to multispacecraft observations of a magnetic cloud Reviewed

    Tomoko Nakagawa, Ayako Matsuoka

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   115 ( A10 )   A10113   2010.10

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2010JA015539

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  • In-flight Performance and Initial Results of Plasma Energy Angle and Composition Experiment (PACE) on SELENE (Kaguya) Reviewed

    Yoshifumi Saito, Shoichiro Yokota, Kazushi Asamura, Takaaki Tanaka, Masaki N. Nishino, Tadateru Yamamoto, Yuta Terakawa, Masaki Fujimoto, Hiroshi Hasegawa, Hajime Hayakawa, Masafumi Hirahara, Masahiro Hoshino, Shinobu Machida, Toshifumi Mukai, Tsugunobu Nagai, Tsutomu Nagatsuma, Tomoko Nakagawa, Masato Nakamura, Koh-ichiro Oyama, Eiichi Sagawa, Susumu Sasaki, Kanako Seki, Iku Shinohara, Toshio Terasawa, Hideo Tsunakawa, Hidetoshi Shibuya, Masaki Matsushima, Hisayoshi Shimizu, Futoshi Takahashi

    SPACE SCIENCE REVIEWS   154 ( 1-4 )   265 - 303   2010.7

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    DOI: 10.1007/s11214-010-9647-x

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  • Magnetic field investigation of Mercury's magnetosphere and the inner heliosphere by MMO/MGF Reviewed

    Wolfgang Baumjohann, Ayako Matsuoka, Werner Magnes, Karl-Heinz Glassmeier, Rumi Nakamura, Helfried Biernat, Magda Delva, Konrad Schwingenschuh, Tielong Zhang, Hans-Ulrich Auster, Karl-Heinz Fornacon, Ingo Richter, Andre Balogh, Peter Cargill, Chris Carr, Michele Dougherty, Timothy S. Horbury, Elizabeth A. Lucek, Fumio Tohyama, Takao Takahashi, Makoto Tanaka, Tsugunobu Nagai, Hideo Tsunakawa, Masaki Matsushima, Hideaki Kawano, Akimasa Yoshikawa, Hidetoshi Shibuya, Tomoko Nakagawa, Masahiro Hoshino, Yoshimasa Tanaka, Ryuho Kataoka, Brian J. Anderson, Christopher T. Russell, Uwe Motschmann, Manabu Shinohara

    PLANETARY AND SPACE SCIENCE   58 ( 1-2 )   279 - 286   2010.1

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    DOI: 10.1016/j.pss.2008.05.019

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  • Fitting a toroidal force-free field to multispacecraft observations of a magnetic cloud Reviewed

    Tomoko Nakagawa, Ayako Matsuoka

    Journal of Geophysical Research: Space Physics   115 ( 10 )   2010

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    DOI: 10.1029/2010JA015539

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  • Electromagnetic full particle simulation of the electric field structure around the moon and the lunar wake Reviewed

    KIMURA Shinya, NAKAGAWA Tomoko

    EPS   60 ( 6 )   591 - 599   2008.6

  • A reexamination of pitch angle diffusion of electrons at the boundary of the lunar wake Reviewed

    NAKAGAWA Tomoko, IIZIMA Masahide

    EPS   58 ( 12 )   e17 - e20   2006.12

  • Solar wind speed within 20 RS of the Sun estimated from limb coronal mass ejections Reviewed

    Tomoko Nakagawa, Nat Gopalswamy, Seiji Yashiro

    Journal of Geophysical Research: Space Physics   111 ( 1 )   2006.1

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    DOI: 10.1029/2005JA011249

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  • Solar wind speed within 20 R-S of the Sun estimated from limb coronal mass ejections Reviewed

    T Nakagawa, N Gopalswamy, S Yashiro

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   111 ( A1 )   2006.1

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    DOI: 10.1029/2005JA011249

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  • The magnetosphere of Mercury and its solar wind environment: Open issues and scientific questions Reviewed

    W. Baumjohann, A. Matsuoka, K. H. Glassmeier, C. T. Russell, T. Nagai, M. Hoshino, T. Nakagawa, A. Balogh, J. A. Slavin, R. Nakamura, W. Magnes

    MERCURY, MARS AND SATURN   38 ( 4 )   604 - +   2006

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    DOI: 10.1016/j.asr.2005.05.117

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  • The magnetosphere of Mercury and its solar wind environment: Open issues and scientific questions

    W. Baumjohann, A. Matsuoka, K. H. Glassmeier, C. T. Russell, T. Nagai, M. Hoshino, T. Nakagawa, A. Balogh, J. A. Slavin, R. Nakamura, W. Magnes

    ADVANCES IN SPACE RESEARCH   38 ( 4 )   604 - 609   2006

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  • Pitch angle diffusion of electrons at the boundary of the lunar wake Reviewed

    NAKAGAWA Tomoko, IIZIMA Masahide

    EPS   57 ( 9 )   885 - 894   2005.9

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    Velocity distribution of the solar wind electrons that penetrate through the lunar wake boundary is investigated by calculating orbits of the electrons injected into model structures of layers of electric fields. Only the electrons with sufficient energy to overcome the potential difference penetrate through the wake boundary. The electrons injected along the magnetic field lines which intersect the model structure undergo pitch angle scattering due to electric field component perpendicular to the magnetic field. After the passage through the electric field, the electrons have significant perpendicular component of velocity as well as the parallel component larger than a lower limit, which is dependent on the electric potential of the wake boundary. The velocity distribution can account for the cyclotron resonance with sunward-propagating whistler mode waves that were detected by GEOTAIL at 27 lunar radii upstream of the moon on October 25, 1994.

    DOI: 10.1186/BF03351866

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  • 下部ELF帯磁界変動の観測と解析

    瀬戸 正弘, 田頭 功, 中川 朋子

    情報処理技術研究所紀要   18 ( 1 )   81 - 92   2005.5

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  • Pitch angle diffusion of electrons at the boundary of the lunar wake Reviewed

    T Nakagawa, M Iizima

    EARTH PLANETS AND SPACE   57 ( 9 )   885 - 894   2005

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    DOI: 10.1186/BF03351866

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  • GEOTAIL observation of upstream ULF waves associated with lunar wake Reviewed

    NAKAGAWA Tomoko, TAKAHASHI Yoshinori, IIZIMA Masahide

    EPS   55 ( 9 )   569 - 580   2003.9

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    Left-handed, circular polarized ULF waves with frequency of 0.3-1.1 Hz were detected by GEOTAIL at 27 lunar radii upstream of the moon when the spacecraft was magnetically connected with the lunar wake. The wave was detected twice at 16: 45-17: 00 and 18: 55-19: 02 on October 25, 1994, when the spacecraft and the moon were on the dawn side of the Earth's magnetosphere. The ULF wave was propagating in a direction nearly parallel to the background magnetic field. The observed frequency and polarization are explained by reversal of polarization of right-handed, sunward-propagating electron whistler waves with frequencies above 1.4 Hz in the solar wind frame of reference, which were excited through the interaction with electron beams flowing in anti-sunward direction downstream of the lunar wake. The downstream flow of electron beam is explained by filtering effect of the potential drop at the boundary of the lunar wake. Low-energy components of electrons are reflected back by the potential drop, and the rest components, with energies higher than that of the electric potential penetrate through the wake. The velocity distribution of downstream electrons would be modified to have some bump or shoulder in energy range to form a beam, which is likely to excite whistler mode wave through cyclotron resonance. The lowest energy of the resonant electrons was calculated to be 0.96-2.5 (keV) from the lower boundary of the detected frequency. The variation in the lowest frequency suggests that there are some regions of the lunar wake where potential drop is reduced.

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  • 女川・飯舘における下部ELF帯環境磁界変動の観測と解析

    瀬戸 正弘, 中川 朋子, 田頭 功

    情報処理技術研究所紀要   16 ( 1 )   25 - 36   2003.5

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  • GEOTAIL observation of upstream ULF waves associated with lunar wake Reviewed

    T Nakagawa, Y Takahashi, M Iizima

    EARTH PLANETS AND SPACE   55 ( 9 )   569 - 580   2003

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    DOI: 10.1186/BF03351789

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  • NOZOMI observation of transient, non-spiral magnetic field in interplanetary space associated with limb CMEs Reviewed

    T Nakagawa, A Matsuoka

    SOLAR WIND TEN, PROCEEDINGS   679   117 - 120   2003

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  • 地震発生前後における下部ELF帯磁界変動の周波数解析結果

    瀬戸 正弘, 中川 朋子, 田頭 功

    情報処理技術研究所紀要   15 ( 1 )   53 - 63   2002.5

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  • Nozomi observation of the interplanetary magnetic field in 1998 Reviewed

    T. Nakagawa, A. Matsuoka

    Advances in Space Research   29 ( 3 )   427 - 432   2002.2

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    DOI: 10.1016/S0273-1177(01)00607-X

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  • Nozomi observation of interplanetary transients ejected as limb coronal mass ejections Reviewed

    T Nakagawa, A Matsuoka

    MULTI-WAVELENGTH OBSERVATIONS OF CORONAL STRUCTURE AND DYNAMICS   13   307 - 308   2002

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  • 1Hz-4Hzの周波数帯における特異な磁界変動

    瀬戸 正弘, 渡辺 富也, 中川 朋子

    情報処理技術研究所紀要   14 ( 1 )   9 - 23   2001.5

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  • GEOTAIL衛星を用いた地球前面定在衝撃波の厚さについて

    栗原 英介, 中川 朋子

    東北工業大学紀要 1 理工学編   ( 21 )   21 - 27   2001.3

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  • 脳波周波数帯における環境電磁界の動態:観測結果第二報

    瀬戸 正弘, 渡辺 富也, 中川 朋子

    東北工業大学紀要 1 理工学編   ( 21 )   37 - 43   2001.3

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  • 太陽方向に伝搬するアルフベン波を利用した惑星間空間磁場の構造解析

    湯村 智子, 中川 朋子

    東北工業大学紀要 1 理工学編   21 ( 21 )   29 - 35   2001.3

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  • GEOTAIL衛星を用いた地球前面定在衝撃波の厚さについて

    栗原英介, 中川朋子

    東北工業大学紀要   21 ( I )   21   2001

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  • 地震に伴うELF帯電磁波異常変動

    瀬戸 正弘, 渡辺 富也, 中川 朋子

    情報処理技術研究所紀要   13 ( 1 )   19 - 35   2000.5

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  • 低周波ELF帯環境電磁界の周波数解析

    中川 朋子, 瀬戸 正弘, 渡辺 富也

    情報処理技術研究所紀要   13 ( 1 )   37 - 48   2000.5

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  • 衛星電位と周辺プラズマの観測から求めた低密度プラズマ中のGEOTAIL衛星の光電子電流密度

    石井 琢, 中川 朋子, 鶴田 浩一郎

    東北工業大学紀要 1 理工学編   ( 20 )   173 - 179   2000.3

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  • 衛星電位と周辺プラズマの観測から求めた低密度プラズマ中のGEOTALL衛星の光電子電流密度(共著)

    石井琢, 中川朋子, 鶴田浩一郎, 早川基, 向井利典

    東北工業大学紀要   20 ( 1 )   173 - 180   2000

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  • Plasma velocity in interplanetary planar magnetic structures Reviewed

    T Nakagawa, S Kokubun, T Mukai

    COUPLING OF THE HIGH AND LOW LATITUDE HELIOSPHERE AND ITS RELATION TO THE CORONA   26 ( 5 )   811 - 814   2000

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    DOI: 10.1016/s0273-1177(00)00011-9

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  • Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft Reviewed

    NAKAGAWA Tomoko, ISHII Takuma, TSURUDA Koichiro, HAYAKAWA Hajime, MUKAI Toshifumi

    EPS   52 ( 4 )   283 - 292   2000

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    The current density carried by photoelectrons emitted from the GEOTAIL spacecraft is estimated from the electric potential of the spacecraft measured in the single probe mode of GEOTAIL/EFD and plasma density and temperature obtained by GEOTAIL/LEP during the period from September 14, 1993 to October 31, 1998, by assuming balance of the currents carried by photoelectrons and ambient thermal electrons. Behaviour of the photoelectron current as a function of spacecraft potential is consistent with the current profile predicted by Grard (1973), and the emitted photoelectrons consist of several components with different temperatures. The saturation density of the low energy component of the photoelectron current is 85&plusmn;33&times;10<SUP>-6</SUP> [Am<SUP>-2</SUP>]. Number density of the photoelectrons is estimated to be 2.9&plusmn;1.4&times;10<SUP>9</SUP> [m<SUP>-3</SUP>] at the surface of the spacecraft, and the average energy of the photoelectrons is 2.1&plusmn;0.5 [eV]. These values are higher than the prediction by Grard but consistent with previous in-flight measurements from GEOS-1, ISEE-1 or Viking.

    DOI: 10.1186/BF03351637

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  • 脳波周波数帯における環境電磁界の動態:観測結果第1報

    渡辺 富也, 瀬戸 正弘, 中川 朋子

    東北工業大学紀要 1 理工学編   ( 19 )   47 - 55   1999.3

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  • ジオテイル衛星で観測された太陽風中の平面状磁場構造の解析

    中川朋子, 国分征, 向井利典, 斎藤義文

    地球惑星科学関連学会合同大会予稿集   1998   173   1998.5

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  • Plasma Waves and Sounder (PWS) experiment onboard the Planet-B Mars orbiter

    ONO Takayuki, OYA Hiroshi, MORIOKA Akira, KUMAMOTO Atsushi, KOBAYASHI Kaori, OBARA Takahiro, NAKAGAWA Tomoko

    Earth Planets Space   50 ( 3 )   213 - 221   1998.3

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    DOI: 10.1186/BF03352106

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  • Evaluation of Offset Components in SAKIGAKE Magnetic Field Data

    NAKAGAWA Tomoko, YUMOTO Kiyohumi, SAITO Takao, KIMURA Hideto, KOBAYASHI Hiroaki

    宇宙科学研究所報告   93 ( 93 )   1 - 35   1997.3

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    Artificial components that contaminate interplanetary magnetic field data are evaluated by using spin-modulation of magnetic field data obtained by Sakigake at 0.8-1.2 A. U. from the Sun. Interference from artificial magnetic field induced by currents flowing on the body of spacecraft is well reproduced by an equivalent magnetic dipole. X-and y-components of the dipole field are separable from those of sensor offsets, where x-and y-directions are perpendicular to the spin axis of the spacecraft. The magnitude of the dipole field component perpendicular to the spin axis is 2-4nT at the sensor of the magnetometer located at 2m from the body of spacecraft, and is proportional to inverse square of the distance from the Sun. Direction of the equivalent dipole was approximately in the y-direction of the SE coordinate system, deviating by 75 degees from the direction toward the Sun. Z-component of the interference field is not separable from the sensor offset, but sum of the interference and the sensor-offset is calculated by using Davis-Smith method and subtracted from output of the magnetometer, leaving no problem in producing interplanetary magnetic field data. The practical 'offset' components vary from-15 to 0nT for x-and z-sensor, and-8 to 0nT for y-sensor depending on the solar distance that gives a measure of the temperature of the magnetometer.

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  • 「さきがけ」で観測された磁場データの一次処理法:惑星間空間磁場と磁気バイアス・磁気オフセットの分離(共著)

    中川朋子, 湯元清文, 斎藤尚生, 木村秀人, 小林博明

    宇宙科学研究所報告   ( 93 )   1 - 34   1997

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  • Evaluation of offset components in SAKIGAKE magnetic field data

    Nakagawa, T, K. Yumoto, T. Saito, H. Kimura, H. Kobayashi

    Bulletin of Institute of Space and Astronautical Science   93   1 - 34   1997

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  • 科学衛星「あけぼの」電場観測に基づく磁気圏の静穏状態の研究

    中川 朋子, 鶴田 浩一郎, 早川 基

    情報処理技術研究所紀要   9 ( 1 )   5 - 14   1996.3

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  • 地磁気座標について:地心双極子モデル,偏心双極子モデル,高次の非双極子成分を含むモデルに基づく三つの地磁気座標系の比較・検討

    渡辺 富也, 中川 朋子

    東北工業大学紀要 1 理工学編   ( 16 )   29 - 45   1996.3

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  • Detection of active region expansion in interplanetary space by Sakigake spacecraft at 1 AU Reviewed

    T Nakagawa, Y Uchida

    MAGNETODYNAMIC PHENOMENA IN THE SOLAR ATMOSPHERE   503 - 504   1996

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  • 科学衛星「あけぼの」電場観測に基づく磁気圏の静穏状態の研究(共著)

    中川朋子, 鶴田浩一郎, 早川基, 松岡彩子

    東北工業大学情報処理技術研究所紀要EOS   9 ( 1 )   5 - 14   1996

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  • Interplanetary planar magnetic structures associated with expanding active regions Reviewed

    T Nakagawa, Y Uchida

    SOLAR WIND EIGHT - PROCEEDINGS OF THE EIGHTH INTERNATIONAL SOLAR WIND CONFERENCE   ( 382 )   465 - 468   1996

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    DOI: 10.1063/1.51428

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  • 5.磁気圏と太陽風の境界(<特集>GEOTAILが見た地球の尻尾)

    中村 正人, 河野 英昭, 藤本 正樹, 中川 朋子, 長野 勇, 八木谷 聡, 寺沢 敏夫

    遊・星・人 : 日本惑星科学会誌   4 ( 2 )   100 - 107   1995.6

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  • SOLAR SOURCE OF THE INTERPLANETARY PLANAR MAGNETIC-STRUCTURES Reviewed

    T NAKAGAWA

    SOLAR PHYSICS   147 ( 1 )   169 - 197   1993.9

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    DOI: 10.1007/bf00675493

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  • 距離2000万kmにおける「さきがけ」マグネトテイル磁場観測

    中川朋子

    第2回科学衛星.宇宙観測シンポジウム(宇宙科学研究所)   1   1993

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  • Extreme-UV imaging of the Martian ionosphere and magnetosphere

    Masato Nakamura, Koujun Yamashita, Koichiro Tsuruda, Takao Nakagawa, Yoshifumi Saito, Tomoko Nakagawa, Toshihiro Ogawa, Tatsundo Yamamoto

    Proceedings of SPIE - The International Society for Optical Engineering   1744   104 - 109   1992

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  • SOUTHWARD MAGNETIC-FIELD IN THE NEUTRAL SHEET PRODUCED BY WAVY MOTIONS PROPAGATING IN THE DAWN-DUSK DIRECTION - REPLY Reviewed

    T NAKAGAWA, A NISHIDA

    GEOPHYSICAL RESEARCH LETTERS   18 ( 3 )   481 - 481   1991.3

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  • On the Feasibility of Imagning Planetary Magnetosphere

    NAKAGAWA TOMOKO, TSURUDA KOICHIRO

    宇宙科学研究所報告. 特集   28 ( 28 )   p111 - 121   1991.3

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    The feasibility of imaging the planetary magnetosphere using resonant scattering of the sunlight by magnetospheric O^+ and He^+ is investigated. Intensities of He^+ resonant line scattered by the Earth's ionosphere and the Earth's plasmasphere are estimated to be 10^2 photons sec^<-1>cm^2 and 0.3 photons sec^<-1>cm^2,respectively, assuming a telescope with a 1% efficiency and an angular resolution of 1°. They are sufficiently intense relative to the background emission coming from the interplanetary ions.

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  • On the feasibility of imaging planetary magnetosphere

    Nakagawa, T, K. Tsuruda

    Bulletin of Institute of Space and Astronautical Science   28   1991

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  • 惑星および地球磁気圏の撮像の可能性について(共著)

    中川朋子, 鶴田浩一郎

    宇宙科学研究所報告(特集巻28号)   28   1991

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  • Reply to Uberoi

    Nakagawa, T, A. Nishida

    Geophysical Research Letters   18 ( 3 )   481 - 482   1991

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  • SOUTHWARD MAGNETIC-FIELD IN THE NEUTRAL SHEET PRODUCED BY WAVY MOTIONS PROPAGATING IN THE DAWN-DUSK DIRECTION Reviewed

    T NAKAGAWA, A NISHIDA

    GEOPHYSICAL RESEARCH LETTERS   16 ( 11 )   1265 - 1268   1989.11

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    DOI: 10.1029/GL016i011p01265

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  • PLANAR MAGNETIC-STRUCTURES IN THE SOLAR-WIND Reviewed

    T NAKAGAWA, A NISHIDA, T SAITO

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   94 ( A9 )   11761 - 11775   1989.9

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    DOI: 10.1029/JA094iA09p11761

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  • HYDROMAGNETIC-WAVES ASSOCIATED WITH COMETARY WATER GROUP IONS - SAKIGAKE OBSERVATION Reviewed

    K YUMOTO, T SAITO, T NAKAGAWA

    ASTRONOMY & ASTROPHYSICS   187 ( 1-2 )   117 - 120   1987.11

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  • Halleyすい星のIon Tailの擾乱とさきがけで観測された太陽風構造 I さきがけ磁場観測と太陽風構造

    斎藤尚生, 湯元清文, 平尾邦雄, 小山孝一郎, 伊藤富造, 中川朋子, 小島正宣

    宇宙科学研究所報告   ( 46 )   16P   1987.3

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    J-GLOBAL

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  • Studies on the Interplanetary Magnetic Field (IMF) observed by Sakigake

    SAITO T., YUMOTO K., HIRAO K., ITOH T., NAKAGAWA T.

    宇宙科学研究所報告. 特集   19 ( 19 )   85 - 102   1987.3

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    This paper is a review of 42 papers concerning the interplanetary magnetic field observed by Sakigake. The papers cover our works that were published only after the launching of Sakigake. (Another review on 46 papers published before the launching is sited in references of the present paper.) A specification of our ring-core magnetometer is described in Chapter 2. Studies on the relation between the solar wind magnetic field observation and comet Halley are reviewed in Chapter 3,which is further divided mainly into two : Upstream region and ion tail region. Theree models on the size of the comet, quasiparallel, and dynamic pressure are reviewed as the new models proposed from our observation. Chapter 4 covers other works from the Sakigake/IMF observation : the two-hemisphere model was substantiated, structure of the IMF discontinuities was analyzed, solar-interplanetery-terrestrial relationships were studied, and GBMR model was proposed. The review is concluded emphasizing importance of further study of fresh comets and of further IMF observation by Sakigake.

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  • Characteristics of IMF Structures Observed by Sakigake at the Closest Approach to Comet Halley

    Nakagawa Tomoko, Saito Takao, Yumoto Kiyohumi

    49 ( 49 )   p1 - 8   1987.3

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    Characteristics of interplanetary magnetic structures are investigated using the IMF data obtained by Sakigake on 11 March 1986 at its closest approach to comet Halley. IMF variations associated with multiple crossings of heliospheric neutral sheet can be detected on the same day. It is also found that two peculiar regions with (1) anomalously many tangential and neither, discontinuities, and with (2) predominant rotational discontinuities existed near the neutral sheet at cometary distance of 7×10^6 km. The magnetic field is found to be weak and to change easily its strength in the former region, while to be steady and strong in the latter. Further studies are needed to clarify whether the structure indicates the solar plasmasheet or the magnetic cloud.

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  • Ion Tail Disturbances of Comet Halley and the Solar Wind Structure as Observed by SAKIGAKE (I) Sakigake/IME Observation and Heliospheric Structure

    Saito Takao, Yumoto Kiyohumi, Hirao Kunio, Oyama Ko-Ichiro, Itoh Tomizo, Nakagawa Tomoko, Kojima Masanobu

    46 ( 46 )   p1 - 15   1987.3

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    In order to study the interaction between the solar wind measured by Sakigake and ion tail disturbances of comet Halley, more than 500 photographs of the comet taken on the ground during this apparition are surveyed. The focus of the present sutdy is the December 31,1985,event, when various types of disturbances occurred, including an outstanding disconnection event (DE)-like knot. Analysis of the Sakigake/IMF data reveals that comet Halley did not encounter the heliospheric neutral sheet on that day, demanding a new explanation for the DE-like event, different from the Niedner-Brandt model. During this event the comet encountered a high-speed solar wind stream from a coronal hole tongue of the sun. The event can be explained by a dynamic pressure model, according to which the DE-like plasmoid was caused by a sudden increase in the dynamic pressure of the solar wind. A result of a computer simulation is found to support this interpretation. The above-stated results were briefly reported already in Geophysical Research Letters. The present work is to report these in detail by separating these into three parts; I, II, and III. (Since different researchers contributed different parts in this detailed work, this is divided into the three parts.) In Part I, the heliospheric structure is obtained from the Sakigake/IMF observation.

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  • Halleyすい星最接近時のSakigake/IMFによる惑星間空間磁場変動特性について

    中川朋子, 斎藤尚生, 湯元清文

    宇宙科学研究所報告   ( 49 )   9P   1987.3

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  • Characteristics of IMF structures observed by Sakigake at the closest approach to comet Halley

    Nakagawa,T, T. Saito, K. Yumoto

    Bulletin of Institute of Space and Astronautical Science   49   1   1987

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  • Halley彗星最接近時のSakigake/IMFによる惑星間空間磁場変動特性について(共著)

    中川朋子, 斎藤尚生, 湯元清文

    宇宙科学研究所報告   49   1987

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  • Ring-Core Fluxgate Magnetometer Installed on Sakigake

    YUMOTO Kiyohumi, SAITO Takao, NAKAGAWA Tomoko, HIRAO Kunio, AOYAMA Iwao, SETO Masahiro

    15   45 - 57   1986.9

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    Sakigake, the first Japanese artificial planet, was launched on 8 January 1985,and passed through the upstream region of comet Halley on 11 March 1986. The ring-core magnetometer carried by Sakigake has successfully detected clear multiple crossings of the helio neutral sheet and the interplanetary magnetic field (IMF) variations. The installed magnetometer had been improved to measure the smaller IMF intensity of &acd;5nT. In the design of the magnetometer system, high fidelity of the magnetometer on board the spacecraft had to be examined with respect to following five problems : (1) electrical exactitude of the basic magnetometer, (2) alignment stability of the triaxial sensor assembly, (3) residual magnetism of the spacecraft, (4) stability of the spacecraft oscillation, and (5) capacity of telemetering of scientific data.

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  • A DISTURBANCE OF THE ION TAIL OF COMET HALLEY AND THE HELIOSPHERIC STRUCTURE AS OBSERVED BY SAKIGAKE Reviewed

    T SAITO, K YUMOTO, K HIRAO, K SAITO, T NAKAGAWA, EJ SMITH

    GEOPHYSICAL RESEARCH LETTERS   13 ( 8 )   821 - 824   1986.8

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    DOI: 10.1029/gl013i008p00821

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  • HYDROMAGNETIC-WAVES NEAR O+ (OR H2O+) ION-CYCLOTRON FREQUENCY OBSERVED BY SAKIGAKE AT THE CLOSEST APPROACH TO COMET HALLEY Reviewed

    K YUMOTO, T SAITO, T NAKAGAWA

    GEOPHYSICAL RESEARCH LETTERS   13 ( 8 )   825 - 828   1986.8

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    DOI: 10.1029/gl013i008p00825

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  • INTERACTION BETWEEN COMET HALLEY AND THE INTERPLANETARY MAGNETIC-FIELD OBSERVED BY SAKIGAKE Reviewed

    T SAITO, K YUMOTO, K HIRAO, T NAKAGAWA, K SAITO

    NATURE   321 ( 6067 )   303 - 307   1986.5

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    DOI: 10.1038/321303a0

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  • Geomagnetic Storm-Associated Interplanetrary Disturbances Observed by SAKIGAKE (Planet-A Mission)

    YUMOTO Kiyohumi, OYAMA Kohichiro, SAITO Takao, HIRAO Kunio, HIRANO Takafumi, NAKAGAWA Tomoko

    14 ( 14 )   p33 - 45   1986.3

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    Geomagnetic storm-associated interplanetary disturbances (IPD) were observed by Sakigake (Planet-A mission) during the interval from June to October, 1985. These IPD's can be classified into four groups related with (i) recurrent high-velocity stream, (ii) transient phenomena in the high solar-wind velocity, (iii) shock-like disturbance, and (iv) abnormally enhanced solar-wind density. The recurrent-stream type disturbances are found to appear predominantly in the minimum phase of the solar sunspot number.

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  • Characteristics of Interplanetary Magnetic Discontinuities Observed by SAKIGAKE (Planet-A Mission)

    NAKAGAWA Tomoko, SAITO Takao, YUMOTO Kiyohumi

    14 ( 14 )   p47 - 57   1986.3

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    The interplanetary magnetic field (IMF) data obtained by Sakigake (Planet-A mission) are statistically analyzed in order to clarify characteristics of the interplanetary discontinuities. Most of the observed phenomena at&acd;0.8-1.0AU are rotational discontinuities. The normal vectors of these discontinuities are found to be nearly in the ecliptic plane. Time constants of the magnetic field changes, obtained by high-and low-time resolution data, are about 30 and 120 sec, respectively. We can find many "discontinuity pairs" with separation times from 5 to 20min (or more). The separation times correspond to characteristic lengths from 20 R_E to 80 R_E in the solar wind. These discontinuities are belived to excite a gomagnetic disturbance.

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  • Characteristics of interplanetary magnetic discontinuities observed by SAKIGAKE (Planet-A mission)

    Nakagawa,T, T. Saito, K. Yumoto

    Bulletin of Institute of Space and Astronautical Science   14   47   1986

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  • 「さきがけ」によって観測された太陽風磁気不連続の特性(共著)

    湯元清文, 小山孝一郎, 斎藤尚生, 平尾邦雄, 平野孝文, 中川朋子

    宇宙科学研究所報告(特集巻14号)   14   33   1986

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Books

  • ULF/ELF waves in the near-Moon space

    NAKAGAWA Tomoko(Low-Frequency Waves in Space Plasmas)

    American Geophysical Union  2016.2  ( ISBN:9781119055006

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    Chapter 17 of "Low-Frequency Waves in Space Plasmas", edited by Keiling, Lee, Glassmeier and Nakariakov, pp. 293-306,

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  • NOZOMI observation of transient, non-spiral magnetic field in interplanetary space associated with limb CMEs

    Solar Wind Ten, edited by M. Velli, R.Bruno, and F.Malara, American Institute of Physics, Melville, New York  2003 

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  • NOZOMI Observation of interplanetary transients ejected as limb coronal mass ejections.

    COSPAR colloquia series Vol.13, Multi-wavaelength observations of coronal structures and dynamics, edited by Martens,C.H. and D.P.Cauffman, Pergaman, New York,  2002 

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  • Detection of active region expansion in interplanetary space by SAKIGAKE spacecraft at 1 AU

    Proceedings of I. A. U. Colloquim 153, "Magneto-dynamic Phenomena in the Solar Atmosphere -Proto types of stellar Magnetic activity-" (Kluwer Academic Publishers)  1996 

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  • Interplanetary planar magnetic structures associated with expanding active regions

    Solar Wind Eight (AIP Press)  1996 

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MISC

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Presentations

  • Correlation of spacecraft potential to the latest electron density data observed by Arase

    Keiya Kawagata, Yasumasa Kasaba, Atsuki Shinbori, Koki Tachi, Fuminori Tsuchiya, Yoichi Kazama, Tomoko Nakagawa, Yuto Katoh

    SGEPSS 2025  2025.11 

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    Event date: 2025.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • The inner edge location of SAPS electric field and the ring current in the equatorial magnetosphere as observed by Arase and SuperDARN International coauthorship

    Hori, T., Y. Miyoshi, S. Nakamura, Y. Kasaba, T. Nakagawa, M. Kitahara, S. Matsuda, N. Nishitani, S. G. Shepherd, J. M. Ruohoniemi, A. Kumamoto, F. Tsuchiya, Y. Kasahara, K. Asamura, Chae-Woo Jun, Y. Kazama, S.-Y. Wang, Sunny W. Y. Tam, K. Keika10, S. Kasahara, S. Yokota, A. Matsuoka, I. Shinohara

    JpGU2023  2023.5  JpGU2023

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    Country/Region:Japan  

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  • Estimation of a spurious electric field arising from spacecraft charging and photoelectron cloud using PWE/EFD onboard ARASE

    Tsubasa Konno, Tomoko Nakagawa, Tomoaki Hori, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Ayako Matsuoka

    SGEPSS 2025  2025.11 

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    Event date: 2025.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Estimation of spurious sunward electric field observed by double probes onboard Arase and Geotail

    Tsubasa Konno, Tomoko Nakagawa, Tomoaki Hori, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Ayako Matsuoka

    SGEPSS 2025  2025.11 

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    Event date: 2025.11

    Language:Japanese   Presentation type:Poster presentation  

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  • Behavior of Spurious Electric Field Components and Spacecraft Charging Measured by Double Probes of PWE/EFD Onboard Arase Invited International conference

    Tomoko Nakagawa, Tomoaki Hori, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Ayako Matsuoka, Tsubasa Konno

    Asia Oceania Geoscience Society 2025  2025.7  Asia Oceania Geoscience Society

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    Event date: 2025.7 - 2025.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Singapore   Country/Region:Singapore  

    Measurements of low-frequency electric field in tenuous plasmas by double probe technique suffer from a spurious electric field component produced by the spacecraft charging. It is not easy to separate them from the natural electric field. The spurious electric field often points toward the sun and the waveform detected by the probes are very close to sinusoidal curve. Even though the probes are spherical, an imbalance of probe potential occurs depending on the spin phase, when the spacecraft potential affects the behavior of photoelectrons from the probes. This paper reports investigation of the potential difference between the probes and the spacecraft measured by Plasma Wave Experiment(PWE)/ Electric Field Detector(EFD) equipped with 4 spherical probes at the tip of 15m wire antenna extending from Arase spacecraft whose spin axis is typically at 15 degrees from the direction of the sun.

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  • Estimation of spurious electric field components produced by spacecraft charging based on the double probe measurements International conference

    Tomoko Nakagawa, Tomoaki Hori, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Yoshizumi Miyoshi, Fuminori Tsuchiya, Atsushi Kumamoto, Atsuki Shinbori, Ayako Matsuoka

    Japan Geoscience Union 2025  2025.5  Japan Geoscience Union

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    Event date: 2025.5

    Language:English   Presentation type:Poster presentation  

    Venue:Chiba  

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  • Occurrence property of spectral resonance structures with frequency separation of 0.2 Hz detected at Kawatabi, Miyagi, Japan International conference

    Ryuya Sonta, Yutaro Endo, Shunsuke Suto, and Tomoko Nakagawa

    Japan Geoscience Union 2025  2025.5  Japan Geoscience Union

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    Event date: 2025.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Chiba  

    In response to new findings of SRS with narrow frequency separations in low latitudes, Kawatabi magnetic field data were Fourier transformed every 128 second in order to obtain high-frequency resolution of 7.8 mHz, and there found SRSs with narrow frequency separation of typically 0.2 Hz. The occurrence showed a clear concentration in winter. They did not show an anticorrelation with the sunspot number, differently from the previously reported SRS with wider frequency separation.

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  • Spatial extent of photoelectrons estimated from the spacecraft potential at electricfield waveform distortion

    Nakagawa, T., T. Konno, H. Ito, K. Mano, T. Hori, Y. Kasaba, Y. Miyoshi, S. Matsuda, Y. Kasahara, I. Shinohara

    156th SGEPSS Fall Meeting,  2024.11  SGEPSS

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    Event date: 2024.11

    Language:Japanese   Presentation type:Poster presentation  

    Venue:Tokyo   Country/Region:Japan  

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  • Subtraction of spurious sunward electric field component generated by photoelectrons and spacecraft charging

    Society of Geomagnetism and Earth, Planetary and Space Sciences  2023.9  Society of Geomagnetism and Earth, Planetary and Space Sciences

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:Sendai   Country/Region:Japan  

    The Electric Field Detector (EFD) of the Plasma Wave Experiment (PWE) instrument onboard the Arase satellite measures the magnetospheric electric field with two sets of double probes. The electric field measurement of Arase suffers from a spurious pseudo-sunward electric field component induced by spacecraft charging and photoelectrons. When detecting the spurious sunward electric field, EFD recorded a distorted waveform of spin modulation in the electric potential difference between the probes and the spacecraft. It is found that the distorted waveform is due to a combined electric potential applied by two model charges each representing the photoelectron cloud and spacecraft charging. Fitting some parameters of the two charges to the observed waveforms, we estimated the amounts of the two charges and the positions of the center of the photoelectron cloud. In this fitting process, it is assumed that the spacecraft charting is displaced by 1 m from the center of the trajectory of the spin motion of the probes toward the direction of the photoelectron cloud. The resultant fitted parameters have successfully reproduced the observed distortion in the waveforms of the potential difference. By subtracting the distorted component, we try to derive the magnetospheric electric field from raw potential waveforms obtained by Arase.

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  • Modeling Electric Potential Produced by Photoelectrons and Spacecraft charging: A case of the Arase satellite International conference

    Nakagawa, T. T. Hori, S. Nakamura, Y. Kasaba, M. Shoji, Y. Miyoshi, M. Kitahara, S. Matsuda, Y. Kasahara, I. Shinohara

    URSI GASS 2023  2023.8  URSI

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    Event date: 2023.8

    Language:English   Presentation type:Poster presentation  

    Venue:Sapporo, Sapporo Convention Center   Country/Region:Japan  

    Measurement of electric fields is a key to understand the magnetospheric dynamics as a response to solar wind. For this objective, double probe technique with long wire antennas extending from a spinning spacecraft has been employed. It is more difficult in a tenuous magnetospheric plasma due to a long Debye shielding distance, dominance of photoemission in current balance of the probes, positive charging of spacecraft body, unstable electric potential of the spacecraft, and so on. In usual, a bias current is fed to the probes to reduce resistance of the probes to the ambient plasma and stabilize the probe potential.,,For the Arase satellite case, the Wire Probe Antenna (WPT) connected to Electric Field Detector (EFD) of the Plasma Wave Experiment (PWE) has the role for this objective. The WPT is two pairs of double probes comprising 60-mm-diameter spheres on tips of 15-m wire antennas. Although the antenna length is limited by the cost reason, Arase is tried to minimize the effect of asymmetric emission of photoelectrons from the spacecraft body by setting its spin axis within 15 degrees from the sun direction [1,2]. Nevertheless, in a tenuous plasma, the measurement suffers from an apparent sunward electric field with a strange, non-sinusoidal waveform of potential difference between the probe and the spacecraft. We identified that the effect of the spinning was still evident even with this design.,For this objective, we investigated to model the photoelectron cloud and the spacecraft charging with a single negative charge outside the spacecraft and a positive charge on the body of the spacecraft, respectively. They are displaced toward the sun from the center of the spin of the wire antennas. Even with the small angle variations to the Sun, the illuminated cross-section of the spacecraft is slightly changed, and the distance of a probe from each electric charge varies depending on the spin phase. It causes the separation of positive and negative charges and produces non-sinusoidal waveform of electric potential at the probe. We can find the best-fit position of the negative charge representing the photoelectron cloud that can reproduce the non-sinusoidal waveform of potential difference between the probe and the spacecraft.,References,[1] Kasahara et al., Earth, Planets and Space (2018) 70:86 https://doi.org/10.1186/s40623-018-0842-4.,[2] Kasaba et al., Earth, Planets and Space (2017) 69:174 https://doi.org/10.1186/s40623-017-0760-x.

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  • Waveform of DC to low-frequency electric field data obtained by PWE/EFD onboard the Arase satellite

    Nakagawa, T, Y. Kasaba, M. Shoji, S. Nakamura, T. Hori, Y. Miyoshi, Kitahara, S. Matsuda, H. Kojima, Y. Kasahara, I. Shinohara

    SGEPSS  2020.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • MHD waves responsible for solar wind heating detected in the type III solar radio bursts

    The Sixth International Workshop on Nonlinear Waves and Turbulence in Space Plasmas  2006 

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  • 2次元粒子シミュレーションによる月周辺の電場構造の解析

    木村進矢, 中川朋子

    宇宙航空研究開発機構特別資料 JAXA-SP-  2005.12 

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  • 月のウェイク境界におけるホイッスラー波の励起

    中川朋子, 飯島雅英

    宇宙航空研究開発機構特別資料 JAXA-SP-  2005.12 

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  • リムCMEの加速度を用いた20太陽半径以内の背景太陽風速の推定

    中川朋子, YASHIRO Seiji, GOPALSWAMY Nat

    日本天文学会年会講演予稿集  2004 

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  • 地球磁気圏ローブ中の月周辺のイオンサイクロトロン波の発生特性

    中川朋子, 綱川秀夫, 斎藤義文

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2015 

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  • 月ウェイク中でタイプIIプロトン侵入に伴って観測されたELF波動の発生機構について

    中川朋子, 綱川秀夫, 斎藤義文

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2014 

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  • 月ウェイク中央で観測された0.1‐10Hzの磁場変動と太陽風プロトン

    中川朋子, 綱川秀夫

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2013 

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  • 太陽風と無磁場天体との相互作用:ウェイクへのイオンの侵入過程

    中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2012 

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  • かぐや衛星によって月周辺で観測される100秒周期磁場変動の発生機構

    中山研仁, 中川朋子, 綱川秀夫, 松島政貴, 高橋太, 渋谷秀敏, 清水久芳

    東北工業大学紀要 1 理工学編  2011.3 

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  • 月周回軌道上のULF波の偏波特性について

    中川朋子, 綱川秀夫

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2011 

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  • かぐや衛星によって月周辺で観測される100秒周期磁場変動の発生機構

    中山研仁, 中川朋子, 高橋太, 綱川秀夫

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2010 

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  • 磁場をもたない小天体と太陽風の相互作用の2次元PICシミュレーション

    中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2010 

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  • Kaguyaで観測されたmonochromatic whistler waveの統計解析

    津川靖基, 寺田直樹, 加藤雄人, 小野高幸, 綱川秀夫, 中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2010 

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  • かぐや(SELENE)衛星によって月の昼側で観測されたホイッスラー波

    中川朋子, 高橋太, 綱川秀夫

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2009 

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  • かぐや衛星による地球磁気圏ローブ中の月周辺のイオンサイクロトロン波の観測

    中川朋子, 綱川秀夫

    日本地球惑星科学連合大会予稿集(Web)  2015 

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  • North-south asymmetry of sense of polarization of magnetic fluctuations at the wake boundary in the By-dominated solar wind magnetic field

    Nakagawa, T, H. Tsunakawa, Y. Saito

    JpGU2017  2017.5 

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  • Diffuse magnetic fluctuations in the frequency range 1-12Hz detected by Kaguya above the polar regions of the moon

    Sugata, Y, S. Ito, T. Nakagawa, H. Tsunakawa

    JpGU2017  2017.5 

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  • Software for virtual 3-dimensional display of Kaguya in-situ observation of magnetic field and the magnetic anomalies on the moon

    Takatera, H, Nakagawa, T, H. Tsunakawa

    JpGU2017  2017.5 

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  • Polarization characteristics of Pc1 pearl structure observed at Kawatabi, Osaki, Miyagi prefecture

    Shinya Miyake, Seiya Yamakawa, Yuma Doi, Tomoko Nakagawa

    JpGU2017  2017.5 

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  • Difference between North-South and East-West components of ELF magnetic disturbances associated with lightning detected at Kawatabi, Osaki, Miyagi, Japan

    Takahashi, S, K. Nishiyama, T. Nakagawa

    JpGU2017  2017.5 

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  • かぐや衛星によって太陽風中で観測された10秒程度の磁場強度増大について

    刈部陽子, 宮澤豪, 村上健太郎, 中川朋子, 綱川秀夫

    日本地球惑星科学連合大会予稿集(Web)  2016 

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  • かぐや衛星とGEOTAIL衛星によって観測された地球磁気圏尾部プラズマシート境界中のイオンサイクロトロン波

    中川朋子, 綱川秀夫

    日本地球惑星科学連合大会予稿集(Web)  2016 

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  • 月ウェイクへの太陽風電子の流入とELF帯磁場変動に関する考察

    中川朋子, 綱川秀夫, 斎藤義文, 西野真木

    日本地球惑星科学連合大会予稿集(Web)  2016 

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  • 衛星かぐやが月周辺で観測した周波数帯3‐10Hzの磁場変動の強さについて

    渡邊祐輔, 照井孝輔, 香川翔吾, 中川朋子, 綱川秀夫

    日本地球惑星科学連合大会予稿集(Web)  2015 

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  • 宮城県大崎市鳴子川渡で観測された14‐20Hzの磁場変動

    菅井智寛, 鵜池竜名, 中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2015 

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  • 2衛星によって観測された磁気ロープのトーラス型モデルへのフィッティング

    中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2007 

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  • Southward magnetic field in the neutral sheet produced by wavy motions propagating in the dawn-dusk direction

    IAGA  1989 

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  • Planar magnetic structures in the solar wind

    IAGA  1989 

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  • The polar cap in intervals of By=Bz=0 in the solar wind

    AGU Western Pacific Geophysical Meeting  1992 

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  • Magnetosphere under the IMF condition By=Bz=0

    IUGG  1991 

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  • Recurrence of planar magnetic structures

    IUGG  1991 

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  • Solar and solar wind conditions for planar magnetic structures

    AGU Western Pacific Geophysical Meeting  1990 

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  • 磁気圏・電離圏シンポジウム 昭和63年度 文部省宇宙科学研究所S

    小島正宜, 寺沢敏夫, 袴田和幸, 桜井隆, 中川朋子, 松田卓也, 桜井邦朋, 斎藤尚生, 牧島一夫

    磁気圏・電離圏シンポジウム 昭和63年度  1989 

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  • Finding the solar source of interplanetary planar magnetic structures: Expanding active regions

    8th STEPsymposium of SCOSTEP  1994 

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  • 距離2000万kmにおける「さきがけ」マグネトテイル磁場観測

    中川朋子, 湯元清文, 斎藤尚生, 大家寛, 森岡昭, 飯島雅英, 小山孝一郎, 阿部琢美

    科学衛星・宇宙観測シンポジウム  1993.10 

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  • Interplanetary planar magnetic structures and magnetic loops on the Sun

    7th Scientific Assembly of IAGA  1993 

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  • 探査機「さきがけ」の磁気バイアスと磁気センサーオフセットの長期変化

    中川朋子, 湯元清文, 斎藤尚生

    地球惑星科学関連学会合同大会予稿集  1997.3 

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  • Planet‐B搭載サウンダーならびにプラズマ波動観測装置による火星電離圏観測計画

    小野高幸, 大家寛, 熊本篤志, 中川朋子, 小原隆博, 岡田達明, 丸橋克英, 宮岡宏, 小林香

    地球惑星科学関連学会合同大会予稿集  1996.3 

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  • 圧力勾配は惑星間空間の平面状磁場構造を生成できるか

    中川朋子

    地球惑星科学関連学会合同大会予稿集  1996.3 

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  • Modeling geometrical configuration of interplanetary planar magnetic structures

    Western Pacific Geophysics Meeting  1996 

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  • Planet‐B搭載PWS観測計画

    小野高幸, 森岡昭, 大家寛, 中川朋子, 小原隆博, 岡田達明, 丸橋克英, 宮岡宏, 小林香

    科学衛星・宇宙観測シンポジウム  1995.12 

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  • Effect of IMF By on Polar Convection in the IMF Condition of Bz=0.

    中川朋子, 鶴田浩一郎, 西田篤弘, 松岡彩子, 早川基

    地球惑星科学関連学会合同大会予稿集  1995.3 

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  • Interplanetary planar magnetic structures associated with expansion active region

    Solar Wind 8  1995 

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  • Detection of active region expansion in interplanetary space by Sakigake spacecraft at 1AU

    International Astrophysics Union (IAU) Colloquium No.153  1995 

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  • 太陽面活動域膨張の対応物としての惑星間空間の平面状磁場構造

    中川朋子, 内田豊

    地球惑星科学関連学会合同大会予稿集  1994.3 

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  • IMF Bz=0は静穏な極域電場をもたらすか

    中川朋子, 鶴田浩一郎, 西田篤弘, 松岡彩子, 早川基, LEPPING R, 納谷朋広, 手嶋啓一

    地球惑星科学関連学会合同大会予稿集  1994.3 

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  • Interplanetary expansion of expanding active regions

    2nd SOLTIP symposium  1994 

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  • Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft

    The 8th GEOTAIL Workshop  2001 

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  • Investigation of the thickness of the Earth's bow shock: GEOTAIL high time resolution data, The First S-RAMP Conference

    First S-RAMP Conference  2000 

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  • The global configuration of magnetic field lines with sunward-propagating Alfven waves

    The First S-RAMP Conference  2000 

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  • NOZOMI observation of the interplanetary magnetic field in 1998

    COSPAR Scientific assembly  2000 

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  • Multipoint observation of Interplanetary magnetic field structures by using NOZOMI spacecraft

    Western Pacific Geophysics Meeting  2000 

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  • Detection of sunward-propagating Alfven waves along IMF

    Western Pacific Geophysics Meeting  2000 

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  • The thickness of Earth's bow shock obtained by GEOTAIL high time resolution MGF data

    Western Pacific Geophysics Meeting  2000 

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  • On the thickness of Earth's Bow shock: GEOTAIL high time resolution magnetic field data

    7th GEOTAIL Workshop  2000 

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  • Detection of Alfven waves propagating toward the sun along IMF

    7th GEOTAIL Workshop  2000 

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  • 活動域膨張の研究 (II)

    鎌田友果, 森田諭, 野瀬友美, 小竹茂太, 岩井重陽, 小野貴士, 中川朋子, 内田豊

    日本天文学会年会講演予稿集  1998 

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  • Interplanetary planar magnetic structures and its relation to solar structure

    Scientific Assembly of COSPAR  1998 

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  • Magnetic structure of interplanetary counterpart of a halo CME: simultaneous observation by NOZOMI and ACE

    COSPAR, Scientific assembly  2004 

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  • Estimation of solar wind speed within 20Rs of the Sun by using limb CMEs

    COSPAR, Scientific assembly  2004 

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  • Electric potential at the boundary of the lunar wake investigated from upstream waves of whistler mode

    AOGS 1st Annual Meeting  2004 

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  • Solar wind speed within 20Rs of the Sun estimated from limb CMEs

    AOGS 1st Annual Meeting  2004 

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  • CMEの初期加速度とその後の惑星間空間での伝搬速度について

    中川朋子

    日本天文学会年会講演予稿集  2003 

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  • Initial speed of CME and their propagation speed in interplanetary space

    IUGG  2003 

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  • Comparison of interplanetary magnetic field observed by Nozomi and Geotail spacecraft

    The seventh GEOTAIL Workshop  2003 

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  • NOZOMI observation of transient, non-spiral magnetic field in interplanetary space associated with limb CMEs

    Solar Wind 10  2002 

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  • NOZOMI Observation of interplanetary transients ejected as limb coronal mass ejections

    Multi-wavelength observations of coronal structures and dynamics - Yohkoh 10 Anniversary Meeting  2002 

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  • Interplanetary Alfven waves propagating toward the sun

    The 8th GEOTAIL Workshop  2001 

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  • Investigation of the thickness of the Earth's bow shock

    The 8th GEOTAIL Workshop  2001 

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  • かぐや(SELENE)衛星搭載磁力計によって観測された100秒周期の磁場変動の発生特性

    中川朋子, 中山研仁, 高橋太, 綱川秀夫

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2009 

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  • 太陽風磁場中の月周辺の電場構造の2次元粒子シミュレーション

    中川朋子

    地球電磁気・地球惑星圏学会総会及び講演会予稿集(CD-ROM)  2008 

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  • A protrusion from the terminator of the Mars observed on November 4, 2003

    37th COSPAR Scientific Assembly 2008, Montreal  2008 

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  • Fitting a torus-type flux rope model to the multi-spacecraft observation of the magnetic cloud on April 16-18, 1999

    37th COSPAR Scientific Assembly 2008, Montreal  2008 

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  • Full particle simulation of the electric field structure around the moon and the lunar wake

    37th COSPAR Scientific Assembly 2008, Montreal  2008 

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  • 2次元全粒子シミュレーションによる月周辺の電場構造の解析

    木村進矢, 中川朋子

    東北工業大学紀要 1 理工学編  2007.3 

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  • Polarization of ultra-low frequency waves observed by Kaguya at low altitude above the Moon in the earth’s magnetosphere

    SGEPSS  2021.11 

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  • Evaluation of the Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard ARASE: The data qualifications and cautions from the first-year observations

    JpGU2018  2018.5 

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  • On the Kelvin-Helmholtz-like waves at the lunar wake boundary in the solar wind

    Nakagawa, T, H. Tsunakawa, Y. Saito

    SGEPSS 2017  2017.10 

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  • Search of energy source of 1-16Hz Whistler Mode Waves Detected by Kaguya in the Lunar Polar Orbit

    Nakagawa, T, F. Takahashi, H. Shimizu, Y. Saito

    JpGU-AGU Joint Meeting 2020  2020.7 

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  • Direction of oscillation of the ELF waves associated with the type-II entry protons in the deepest lunar wake

    Nakagawa, T, F. Takahashi, H. Shimizu, Y. Saito

    SGEPSS  2019.10 

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  • Extremely Low Frequency Whistler Mode Wave above the Polar Region of the Moon Detected by Kaguya

    Nakagawa, T, F. Takahashi, H. Shimizu, Y. Saito

    URSI-JRSM2019  2019.9 

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  • Energy conversion process at the lunar wake boundary

    Nakagawa, T, H. Tsunakawa, Y. Saito

    JpGU2019  2019.5 

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  • Magnetic field disturbances associated with the magnetic dipolarization observed by Arase (ERG) in the inner magnetosphere

    JpGU2019  2019.5 

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  • Falling-tone ELF magnetic fluctuations detected by Kaguya above the lunar polar region

    Nakagawa, T, H. Tsunakawa

    SGEPSS  2018.11 

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  • Field aligned electron flow generated by vortex at the lunar wake boundary

    JpGU2018  2018.5 

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  • Magnetic field disturbances observed by Arase (ERG) associated with the magnetic dipolarization

    JpGU2018  2018.5 

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  • Small scale limb compressions detected by Kaguya

    Nakagawa, T, H. Tsunakawa

    SELENE symposium 2017  2017.9 

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  • Diffuse Whistler Mode Waves Detected by Kaguya in the Lunar Polar Orbit

    Nakagawa, T, F. Takahashi, H. Shimizu, Y. Saito

    URSI GASS 2021  2021.9 

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  • Elliptically polarized 0.01-0.3 Hz magnetic field variation in the lunar wake

    Nakagawa, T, F. Takahashi, H. Shimizu, Y. Saito

    JpGU2021  2021.6 

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  • Interference with electric field observation caused by spacecraft charging and photoelectrons

    2022.11 

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  • Short Period Magnetic Field Enhancements Detected by Kaguya Around the Moon in the Solar Wind

    T. Nakagawa, F. Takahashi, H. Shimizu, Y. Saito

    3rd URSI AT-AP-RASC  2022.5 

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  • Hot flow anomalies and smallest scale limb compression detected by Kaguya around the moon in the solar wind

    JpGU2022  2022.5 

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  • Spin-modulated components in the spacecraft potential distorting the electric field measurement of the Arase satellite

    2021.11 

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  • Velocity of ions refilling the lunar wake observed by Kaguya

    CHiba, K., K. Mochiishi, T. Nakagawa, Y. Saito, F. Takahashi

    JpGU2022  2022.5 

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    -  2021.2  Nagoya University ISEE

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  • Spectral Resonance Structure in 0.5-8Hz Magnetic Field Variations Detected at Kawatabi, Miyagi, Japan International conference

    Taiki Sato, Chihiro Kumagai, Tomoko Nakagawa

    URSI GASS 2023  2023.8 

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    Venue:Sapporo, Sapporo Convention Center   Country/Region:Japan  

    This paper reports spectral resonance structures in 0.5 ? 8 Hz magnetic field variations found in the ELF magnetic field data obtained by an induction magnetometer EL-12 constructed by Tierra Technica Co. Ltd, placed in NorthSouth direction at Kawatabi, Osaki, Miyagi prefecture Japan. The magnetic latitude of the observation site is N30 and the L value is about 1.3. The magnetometer detects magnetic field variations from 0.1 Hz to 44 Hz at a sampling frequency of 128 Hz. The observation started on December 11, 1997 and continued until February 12, 2020 although the data coverage was limited to 51%. The data were Fourier transformed every 8 second and averaged for 2 minutes to be displayed in the form of dynamic spectra at https://www.ice.tohtech.ac.jp/nakagawa/elfdata/index.html. Figure 1 shows an example.,,In addition to clear enhancements at Schumann resonance frequencies at 8 Hz, 14 Hz, 21 Hz, 28 Hz, we can see structured enhancements approximately at 1 Hz, 2 Hz, 2.5 Hz, 3.5 Hz, 4.5 Hz. They are thought to be spectral resonance structures (SRS) generated by ionospheric Alfven resonator which is an ionospheric cavity with minimum Alfven velocity bounded by E layer and a steep gradient of the Alfven velocity above the maximum of F layer [1-4]. In accordance with previous literatures, the occurrence of the spectral resonance structure in Kawatabi was restricted within the nighttime from17 LT to 06 LT. The frequency rose from the evening toward the midnight. They were detected in rather quiet periods of geomagnetic activity. Two decades of observations show a clear anticorrelation between the occurrence of the spectral resonance structures and the sunspot number, indicating a solar control of the low-latitude ionosphere.,,References,[1] T. Bosinger, et al., J. Geophys. Res., 107, A10, 1281, 9 October 2002, doi:10.1029/2001JA005076.,[2] A. G. Yahnin, et al., Annales Geophysicae, 21, 2003, pp.779?786.,[3] V. V. Surkov, et al., J. Geophys. Res., 111, A01303, 31 January 2006, doi:10.1029/2005JA011320.,[4] M. Nose, et al., J. Geophys. Res., Space, 122, 05 July, 2017, pp.7240-7255, doi:10.1002/2017JA024204.

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  • Anti-correlation between sunspot number and spectral resonance structures of ELF magnetic variations at Kawatabi, Japan

    Taiki Sato, Chihiro Kumagai, Tomoko Nakagawa

    JpGU2023  2023.5  JpGU

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    Spectral resonance structures in a frequency range 0.5 ?8 Hz were found in the ELF magnetic field data obtained at Kawatabi, Osaki, Miyagi prefecture Japan (magnetic latitude N30) during the period from December 11, 1997, to June 2, 2016. The data were obtained by an induction magnetometer placed in North-South direction at a sampling frequency of 128 Hz. The data were Fourier transformed every 8 second and averaged for 2 minutes to be displayed in the form of dynamic spectra [1]. Figure 1 shows an example. We can see structured enhancements approximately at 1 Hz, 2 Hz, 2.5 Hz, 3.5 Hz, 4.5 Hz. They are thought to be spectral resonance structures (SRS) generated by ionospheric Alfven resonator which is an ionospheric cavity with the minimum Alfven velocity bounded by E layer and a steep gradient of the Alfven velocity above the maximum of F layer [2]. In accordance with previous literatures, the occurrence of the spectral resonance structure in Kawatabi was restricted within the nighttime from17 LT to 06 LT. The frequency rose from the evening toward the midnight. They were detected in rather quiet periods of geomagnetic activity. Although the data coverage was limited as low as 51%, nearly two decades of observations show a clear anticorrelation between the occurrence of the spectral resonance structures and the sunspot number, consistently with the scenario of ionospheric cavity with minimum Alfven velocity.,[1] https://www.ice.tohtech.ac.jp/nakagawa/elfdata/index.html.,[2] M. Nose, et al.(2017), J. Geophys. Res., Space, 122, pp.7240-7255, doi:10.1002/2017JA024204.

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  • Non-sinusoidal waveforms of electric potential produced by photoelectrons and spacecraft charging detected by Arase PWE

    Nakagawa, T. T. Hori, S. Nakamura, Y. Kasaba, M. Shoji, Y. Miyoshi, M. Kitahara, S. Matsuda, Y. Kasahara, I. Shinohara

    JpGU2003  2023.5  JpGU

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    Measurement of the electric field is key to understanding the magnetospheric dynamics as a response to the solar wind. For this objective, many spacecraft have employed the double probe technique with long wire antennas extending from a spinning spacecraft body. Despite improvements of the technique achieved by past satellites, accurate measurement of the electric field is still difficult and challenging particularly in a tenuous magnetospheric plasma for several reasons, such as a long Debye shielding distance, dominance of photoemission in the current balance of probes, positive charging of a spacecraft body, unstable electric potential of the spacecraft. On most of the recent satellites, a bias current is fed to the probes to reduce the resistance of probes to the ambient plasma and thereby stabilize the probe potential.,,In the Arase satellite case, the Wire Probe Antenna (WPT) connected to the Electric Field Detector (EFD) of the Plasma Wave Experiment (PWE) is responsible for the electric field measurement. The WPT is two pairs of double probes comprising 60-mm-diameter spheres on tips of 15-m wire antennas. Although the antenna length is limited due to an issue of the development cost, Arase attempted to minimize the effects of asymmetric emission of photoelectrons from the spacecraft body by setting its spin axis within 15 degrees from the sun direction. Nevertheless, in a tenuous plasma, the measurement suffers from a fairly persistent, apparent sunward electric field with a strange, non-sinusoidal waveform of potential difference between the probes and the spacecraft.,,In order to understand how the spurious sunward field appears, we examined the observed potential waveform data, and modeled the photoelectron cloud and the spacecraft charging by assuming a single negative charge outside the spacecraft and a positive charge on the spacecraft body, respectively. The photoelectrons are emitted from the sunlit side of the spacecraft, and there will be a sunward concentration of photoelectrons. Also, there will be a sunward shift of positive charge on the spacecraft however high the skin conductivity is. We set the model charges shifted toward the sun at different distances from the center of the spin of the wire antennas. Even with small angle of the spin axis with respect to the Sun, the model charges are off the spin axis, and the distance of a probe from each electric charge varies depending on the spin phase. Separation of positive and negative charges causes difference in electric potential arising from them, producing a non-sinusoidal waveform of electric potential at the probe. For each spin of Arase we calculate the electric charges and the best-fit position of the negative charge that can well reproduce the observed waveforms of potential difference between the probes and the spacecraft. With this simple model, the apparent sunward electric field is partly reproduced although an effect of spin-modulation of photoemissions arising from variation of the illuminated cross-section of the spacecraft has not yet been considered.

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  • Removal of spurious sunward electric field components generated by photoelectrons and spacecraft charging

    T. Nakagawa, T. Hori, Y. Kasaba, M. Shoji, Y. Miyoshi, S. Matsuda, Y. Kasahara, I. Shinohara

    Japan Geophysical Union 2024 Assembly  2024.5  Japan Geophysical Union

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  • Spectral resonance structures with frequency separation of 0.2 Hz detected at Kawatabi, Miyagi, Japan

    Hayato Konno, Makishi Kikuchi, Tomoko Nakagawa

    Japan Geophysical Union 2004 assembly  2024.5  Japan Geophysical Union

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Works

  • 太陽風中の月および月ウェイクの電磁環境

    2009 - 2011

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  • 太陽風速度の発展過程の研究

    2005 - 2007

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  • Estimation of solar wind speed within 20Rs of the Sun by using limb CMEs

    2002 - 2005

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  • 非スパイラル太陽風磁場とCME

    2002 - 2003

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  • Observation of Solar Wind Magnetic Field by using NOZOMI Spacecraft

    1998

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  • 惑星間空間非スパイラル磁場による太陽風の放出源の同定

    1997 - 1998

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  • Electromagnetic Environment in Extreme Low Frequency Range

    1997

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  • 惑星間空間の平面状磁場構造

    1995 - 1996

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  • Solar source of non-spiral magnetic field

    1994 - 1995

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  • 太陽風磁場構造の発展過程

    1993

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  • 太陽風磁場の三次元構造

    1990 - 1991

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Awards

  • Tanakadate Awardrd

    2020.5   SGEPSS  

    Nakagawa Tomoko

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    Award type:Award from Japanese society, conference, symposium, etc.  Country/Region:Japan

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  • Tanakadate Award

    2020.5   Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS)   Studies on solar wind magnetic structure and the interaction of small bodies with ambient plasma

    Tomoko Nakagawa

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    Award type:Award from Japanese society, conference, symposium, etc.  Country/Region:Japan

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  • トーキン科学技術振興財団研究奨励賞

    1994  

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    Country/Region:Japan

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Research Projects

  • -

    2024.4 - 2025.3

    Planetary Plasma and Atmospheric Research Center (PPARC), Graduate School of Science, Tohoku University  - 

    T. Nakagawa, Y. Kasaba, F. Tsuchiya

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    Authorship:Principal investigator 

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  • -

    2023.4 - 2024.3

    Planetary Plasma and Atmospheric Research Center (PPARC), Graduate School of Science, Tohoku University  - 

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    Authorship:Principal investigator 

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  • -

    2022.4 - 2023.3

    Planetary Plasma and Atmospheric Research Center (PPARC), Graduate School of Science, Tohoku University  - 

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    Authorship:Principal investigator 

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  • -

    2019.4 - 2020.3

    Planetary Plasma and Atmospheric Research Center (PPARC), Graduate School of Science, Tohoku University  - 

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    Authorship:Principal investigator 

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  • -

    2018.4 - 2019.3

    Planetary Plasma and Atmospheric Research Center (PPARC), Graduate School of Science, Tohoku University  - 

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    Authorship:Principal investigator 

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  • First Mercury magnetospheric exploration by electromagnetic waves: Laying the groundwork and initial observational activities

    Grant number:24K00687  2024.4 - 2028.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Authorship:Coinvestigator(s) 

    Grant amount:\18720000 ( Direct Cost: \14400000 、 Indirect Cost:\4320000 )

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  • Solar wind interaction with the moon in the scale between magnetohydrodyamic and cyclotron radius scales

    Grant number:18K03727  2018.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Nakagawa Tomoko

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    Authorship:Principal investigator 

    Grant amount:\3380000 ( Direct Cost: \2600000 、 Indirect Cost:\780000 )

    Knowledge of solar wind interaction with the moon has been renewed by recent high time resolution observations. In addition to previously known hydrodynamic scale phenomena such as wake formation and upstream wave generation by reflected ions, we have studied magnetic field variations such as limb compression and diamagnetic cavities with magnetic enhancements with duration shorter than ion gyro period, shear Alfven waves generated at thin wake boundary, or diffuse whistler mode waves above the polar region separated from their generator ions. Their generation mechanisms were related with smallness of the magnetic anomaly, lunar radius smaller than the Larmour radius of the ions reflected by the moon, or thin boundary of the lunar wake.

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  • Study on the electromagnetic environment formed by non-magnetized body in the solar wind

    Grant number:24540480  2012.4 - 2016.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Nakagawa Tomoko, TSUNAKAWA Hideo, SAITO Yoshifumi

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    Authorship:Principal investigator  Grant type:Competitive

    The ion entry into the wake behind an obstacle in the solar wind was studied using two-dimensional, electromagnetic full-particle simulations. The Electric field produced by the negative electric charge on the nightside surface of the obstacle accelerates ions toward the void, over longer Debye length than in the solar wind due to the reduced electron density. The ions can access the deepest wake behind a large-scale obstacle being accelerated over a long distance.
    Kaguya detected low-frequency magnetic field fluctuations generated by the modified velocity distribution of the solar wind particles reflected or absorbed by the moon. The reflected protons are responsible for the generation of ULF and monochromatic ELF waves through interaction with magnetohydrodynamic and whistler waves in the solar wind. Beams of electrons reflected above the dayside lunar magnetic anomaly, or sucked into the proton rich region in the central wake are the source of broadband ELF waves.

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  • 太陽風プラズマ流の中の月の電磁的役割の解明

    2011.11 - 2013.5

    住友財団  基礎科学助成 

    中川 朋子

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    Authorship:Principal investigator  Grant type:Competitive

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  • Electromagnetic environment of the moon in the solar wind and the lunar wake

    Grant number:21540461  2009.4 - 2012.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NAKAGAWA Tomoko, TSUNAKAWA Hideo, SAITO Yoshifumi

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    Authorship:Principal investigator  Grant type:Competitive

    The solar wind interaction with the moon was studied using a two-dimensional electromagnetic full particle simulation and Kaguya observation. The solar wind magnetic field controls the direction of the thermal flow of the electrons and causes an asymmetry of the negative charging of the downstream-side surface. The solar wind ions are accelerated by the negative surface charging, while the solar wind electrons are expelled by the negative charging and flow away along the field line producing streaks of enhancements of the electron density. On the dayside surface, 0. 01 Hz and 0. 03-5 Hz magnetohydrodynamic waves are excited by the solar wind protons reflected by the moon through cyclotron resonance.

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  • Evolution process of solar wind speed

    Grant number:17540424  2005.4 - 2007.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NAKAGAWA Tomoko

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    Authorship:Principal investigator  Grant type:Competitive

    (1) By using the linear relationship between the initial speed and the initial acceleration of the limb CMEs, the solar wind speed in the vicinity of the Sun is estimated on the assumption that a dragging force is acting depending on the speed difference between the CMEs and the ambient plasma. The solar wind speed within 20 solar radii estimated from the low-latitude CMEs ranged from 100 to 700 km s^<-1>, while the solar wind speed measured at 1 AU ranged from 300 to 700 km s^<-1>. It suggests that the low-latitude solar wind almost completes accelerating within 20 solar radii, but occasionally additional acceleration is present beyond 20 solar radii.
    (2) Magnetohydrodynamic (MHD) waves are thought to play an important role in heating and acceleration of the solar wind. An attempt was made to detect MHD waves in the decametric type-3 solar radio bursts in the frequency range from 15 to 40 MHz. There found 1-3 peaks at around 18, 23, or 31 MHz in the spectra, corresponding to the distance of about 1.3 to 1.7 solar radii from the Sun. It suggests that the effective energy conversion from electron-beam driven Langmuir waves to electromagnetic waves occurs under the enhanced plasma density fluctuations of the compressive MHD waves which are responsible to solar wind acceleration.
    (3) A torus-type flux rope model applied to an interplanetary magnetic cloud was tested by the simultaneous magnetic field observations by ACE and NOZOMI spacecraft. On the basis of a single observation by ACE, the magnetic cloud was once fitted to a torus-shaped flux rope model through which the spacecraft passed at the southern tip, however, this study revealed that the spacecraft passed through the southern tip, suggesting that the magnetic rope originating from the northern hemisphere of the Sun crosses the equatorial plane.

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  • Non-Spiral Interplanetary Magnetic Field and Coronal Mass Ejections

    Grant number:14540416  2002.4 - 2004.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NAKAGAWA Tomoko

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    Authorship:Principal investigator  Grant type:Competitive

    The speeds of propagation of CMEs in interplanetary space are less distributed than their initial speeds measured on their departure from the limb of the Sun. Gopalswamy et al.(2000, 2001) presented a linear relationship between initial speeds of limb CMEs and their average acceleration during their travel time in interplanetary space. The linear relationship suggests that some dragging force is acting on CMEs. If similar relationship holds within 20 solar radii from the Sun, it would give information on the initial speed of 'ambient' solar wind in the vicinity of the Sun. The relationship between the initial acceleration and the initial speeds of limb CMEs was examined by using SOHO/LASCO CME Catalogue. For the cases for which correlation coefficient was fairly good (from -0.6 to -I), the 'ambient' solar wind speed within 20 solar radii was estimated to be 150 -570 km/s. It is somewhat slower than but close to the speeds of real solar wind measured in interplanetary space.
    Interplanetary counterparts of a halo CME which occurred on April 13, 1999, were observed by NOZOMI and ACE on April 16-18, when the two spacecraft were within 3 degrees in heliocentric longitude and 0.2 AU in heliocentric distance. The interplanetary magnetic fields had filamentary structures with large Bz components, and the Bz component was positive at NOZOMI while negative at ACE. Both magnetic fields were different from a magnetic cloud. It implies that the CME had a number of filamentary structures of magetic field lines with various directions. An interplanetary magnetic field of this kind can be used for detection of candidates of interplanetary counterparts of CMEs.

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  • Solar source of non-spiral interplanetary magnetic field

    Grant number:09640533  1997.4 - 1999.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NAKAGAWA Tomoko

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    Authorship:Principal investigator  Grant type:Competitive

    Non-Parker type interplanetary magnetic field comes from non-static source on the Sun, and is expected as a key that relates solar wind and its solar source. As has been recognized in the Yohkoh soft X-ray images, there are various activities on the photosphere which release ejecta into interplanetary space. It is difficult to identify all the interplanetary counterparts of the ejecta because they can be easily missed by point observation from interplanetary spacecraft. It is more convenient to examine non-spiral magnetic field in interplanetary space and then to investigate their relationship to the solar phenomena.
    In this study, non-Parker type interplanetary objects, planar magnetic structures, have been examined by using magnetic field and low-energy particle data obtained by GEOTAIL spacecraft. In a planar magnetic structure, magnetic field vectors are all parallel to a plane that is inclined to the ecliptic plane. Previous study showed that the sources often coincided with expanding ioops from active regions. In order to examine their magnetic connection to the photosphere, angular distribution of low-energy electrons in planar magnetic structures were examined by using Low Energy Particle(LEP) experiment onboard GEOTAIL.Bidirectional electrons characteristic of closed field lines were not found in planar magnetic structures.
    Previous studies suggested that the jumps in magnetic field were tangential discontinuities, however, velocity jumps had not been investigated because of lack of high-time resolution observation of the solar wind velocity. In this study, GEOTAIL/LEP data were used to calculate velocity component Vn normal to the plane of the structure and the propagation speed U of the discontinuity surface. It resulted in that the jumps were tangential discontinuities in which the speed U was equal to Vn.

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  • Interplanetary Planar Magnetic Structures

    Grant number:07640591  1995.4 - 1996.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NAKAGAWA Tomoko

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    Authorship:Principal investigator  Grant type:Competitive

    Planar magnetic structures in which interplanetary magnetic field vector takes almost all directions that are parallel to a plane are correlated with EXPANDING ACTIVE REGIONS on the Sun by using Sakigake solar wind data and Yohkoh soft X-ray images of the Sun. During the period from January to July, 1993, we could identify three typical planar magnetic structures with the active region expansions found by Uchida et al. [1992] in the Yohkoh soft X-ray images, from which loop-like structures of active-region corona expand outward repeatedly at speeds of a few to a few tens of km/s even in the absence of any sizable flares. The active region expansions are expected to play an important role in mass loss from the Sun. On the other hand, not all the active regions were observed as planar structures in interplanetary space. In 16 Sakigake observations of solar wind plasma whose solar sources coincided with active regions, 9 had non-spiral magnetic field including planar structures, high ion density or both of them, but the other 7 (44%) exhibited no significant difference from average solar wind with spiral field.
    Pressure gradient in the solar wind is examined as a candidate cause of planar magnetic structures. In five of Sakigake planar magnetic structures with no bulk-speed gradient, two were in the regions of pressure gradient but the others were not. Flattened, intertwined flux tubes of high-beta plasma (Crooker et al., 1996) are re-examined to model planar magnetic structures. In order to reproduce a planar magnetic structure, a large number of flux ropes with small helicity are required. Variation of field direction is mainly due to variation of orientation of rope axs, rather than to field rotations in each of ropes.

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  • 太陽風磁場構造の発展過程

    Grant number:05740311  1993.4 - 1994.3

    文部省  科学研究費補助金 奨励(A)  奨励研究(A)

    中川 朋子

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    Authorship:Principal investigator  Grant type:Competitive

    本研究の目的は、太陽面磁場構造と太陽風磁場構造をつなぐ重要な手がかりである非平均的な太陽風磁場、とりわけ、太陽磁場の時間発展を反映すると考えられる「太陽風中の平面状磁場構造」について、
    1.太陽面上のどの磁場構造に対応付けられるかを、惑星間空間と太陽面の双方の観測から明らかにし、
    2.太陽面上に両端を持つ磁力線が惑星間空間に引き出され「平面状磁場構造」として観測される、というモデルを確かめること
    であったが、惑星間空間探査機「さきがけ」の磁場観測と太陽観測衛星「ようこう」軟X線望遠鏡観測を用いることによって、平面状磁場構造と光球面近傍の磁力線形状との対応付けに成功した。
    対応付けを容易にするため、太陽面の静穏であった1993年1-7月を解析期間とし、この期間中,「さきがけ」によって観測された3つの典型的な平面状磁場構造について、太陽風速データを用いて構造が太陽から放出された日時を求め、その発生源と思われる領域を「ようこう」X線画像を用いて調べた。その結果、平面状磁場構造の発生源は3つとも最近「ようこう」で発見された「活動域膨張」を示している領域に対応することがわかった。「活動域膨張」は、下部コロナで観測される、太陽面上の活動域からループ状の構造が惑星間空間に向かって放出される現象である。活動域の磁場は非常に強いため、惑星間空間まで引き出されることはないという考えがこれまでの主流であったが、本研究によって「活動域膨張」が惑星間空間まで引き出されることが示された。発生源とみられる活動域のうち少なくともひとつはフレアを伴っておらず、近傍にフレアがある場合でも小規模のものしか無いことから、平面状磁場構造の発生は、フレアによらず「活動域膨張」によることがわかる。

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  • Investigation of the Geomagnetic Tail by the GEOTAIL Satellite

    Grant number:04044168  1992 - 1994

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for international Scientific Research  Grant-in-Aid for international Scientific Research

    NISHIDA Atsuhiro, HOSHINO Masahiro, MACHIDA Shinobu, SAITO Yoshifumi, OBARA Takahiro, NAGAI Tsugunobu, MUKAI Toshifumi, TAKAHASHI Kazue, ARAKI Tooru, HIRAHARA Masafumi, MATSUMOTO Hiroshi, HASEBE Nobuyuki, MAEZAWA Kiyosi, FUJIMOTO Masaki, NAGATA Katsuaki, OKADA Toshimi, KIMURA Iwane, HASHIMOTO Kouzou, DOKE Tadayosi, ACUNA M., NAGANO Isamu, ANDERSON R.r., WILKEN B., WILLIAMS D.j., MOZER F., TROSHICHEV O., ZELENYI L., FELDSTEIN Y., SHIOKAWA Kazuo, NAKAMURA Tadasu, YAMAMOTO Tatsundo, TERASAWA Toshio, KOKUBUN Susumu, NAKAGAWA Tomoko, MATSUOKA Ayako, NAKAMURA Masato, FRANK L.a., HAYAKAWA Hajime, FAIRFIELD D.a., TSURUDA Koichiro

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    Grant amount:\25000000 ( Direct Cost: \25000000 )

    1. Global structure of the distant tail GEOTAIL observations have confirmed that the magnetotail extends to 200 Re and beyond. It flaps violently north-south as well as east-west with amplitudes comparable to its average radius of about 20 Re, but there is no indication that it is filamentary. Plasma sheet is clearly distinguishable from the lobe or the magnetosheath by high temperature (around 1 keV) and low density (around 0.1/cc). Its magnetic structure and internal convection profile are governed by the north-south polarity of the interplanetary magnetic field.
    2. Distant tail under the southward IMF Under the southward IMF,magnetic field lines convect toward the neutral sheet where they are reconnected. The probability that open field lines are reconnected earthward of 150 Re is about 75%. The reconnection rate is the highest at the tail axis and decreases toward the flanks by a factor of 2 to 3.
    3. Plasma heating and relaxation at the plasma-sheet lobe boundary At the plasma sheet boundary, the slow-mode shock is formed in the convective flow where the cold ions of the lobe become heated. Very energetic ions flow upstream from the shock. The mixed population of cold and hot particles in this boundary region is a rich source of plasma waves whose non-linear development is seen.
    4. Distant tail under northward IMF Under the northward IMF,the open field lines which are presumably produced in the cusp region of the dayside magnetopause sweep across the tail. The convection is parallel to the neutral sheet which is highly twisted in the direction of IMF and has opposite directions (dawn to dusk vs dusk to dawn) on opposite sides of the neutral sheet. The source of the hot plasma in the plasma sheet which is located in the open field lines poses a new problem.

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  • 太陽風磁場の三次元構造

    Grant number:02952108  1990.4 - 1992.3

    文部省  科学研究費補助金 奨励(学振)  奨励研究(特別研究員)

    中川 朋子

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    Authorship:Principal investigator  Grant type:Competitive

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  • Magnetotail observation at 3000 Earth Radii

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    Grant type:Competitive

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  • 3-D structure of the solar wind magnetic field

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    Grant type:Competitive

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  • Interplanetary planer magnetic structures

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    Grant type:Competitive

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Other

  • 学都「仙台・宮城」サイエンスマップ~光編~』「シューマン共振」

    2019.7

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    学都「仙台・宮城」サイエンスマップ~光編~』第4版から第8版にシューマン共振の項目について記事提供,https://science-community.jp/event/detail.php?event_id=1033%22

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Allotted Class

  • 解析Ⅱ及び同演習 full-time faculty

    2023autumn semester

  • 環境電磁工学特論 full-time faculty

    2023spring semester

  • 解析Ⅲ

    2023spring semester

  • 解析I full-time faculty

    2023spring semester

  • 解析II及び同演習

    2022autumn semester

  • 解析III full-time faculty

    2022spring semester

  • 解析I full-time faculty

    2022spring semester

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Teaching Achievements

  • 学科数学系教員との連携

    Type:Innovation in educational contents or methods (includes course evaluation etc.)  2023.4 - 2024.1

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    大学で学ぶ科目相互の関連性と有用性を認識させるため、線形代数、数学基礎などの科目の進度に合わせ、他科目の学習内容を活用した授業を行う とともに、数学関係教員および学習支援センター教員とで学生のパフォーマンスを共有

  • 授業全回における宿題提出と添削

    Type:Innovation in educational contents or methods (includes course evaluation etc.)  2023.4 - 2023.7

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    授業内容理解の確認と、論述の仕方を身に着けさせるための答案の添削 (教員1名では無理なので、上級生を起用しチームで添削作業を行う) 2023年度1年必修解析1では、授業14回に対し14回宿題を出題、13回添削し返却

  • manabi相談室との連携

    Type:Other achievement about your educational practices (except for the above-mentioned)  2012.4 - 2016.9

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    解析演習の授業において数学の学力不足の学生の状況を共有、学生に対しmanabi相談室の利用を指示

  • 宿題の添削と返却

    Type:Other achievement about your educational practices (except for the above-mentioned)  2005.4 - 2024.3

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    復習の習慣を付けるとともに正確な答案の記述方法の指導及び各学生に到達度を伝達するため

  • 授業前後の豆テストの実施と添削

    Type:Other achievement about your educational practices (except for the above-mentioned)  2005.4 - 2024.3

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    物心両面での授業準備態勢の誘導と理解度チェックのため

  • ウェブサイトによる問題解説

    Type:Other achievement about your educational practices (except for the above-mentioned)  2005.4 - 2024.3

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    テイラー展開、ラプラス変換等、パターン化された解法を自学自習出るようなページを作成公開

  • 自動車学校方式による特別再履修

    Type:Other achievement about your educational practices (except for the above-mentioned)  2005.4 - 2011.12

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    修得すべき内容を項目立てし、再履修者が勉強してきた項目ごとに見極めを行い、全項目見極めで検定を行う

  • 学生本人が自分の学習態度を考えるような授業アンケートの開発と実施

    Type:Other achievement about your educational practices (except for the above-mentioned)  2002.4 - 2023.7

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    アンケートに答えることを通じて、自分の学習態度を顧みると同時に時自分の成長を感じることができる様な設問を考え、結果をウェブサイト上で公表

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Textbooks and Teaching Materials

  • 初心者用 テイラー展開 解説

    2021

  • 初心者用 たたみこみの解説

    2021

  • 初心者用 オイラーの公式 解説

    2021

  • 初心者用 ラプラス変換の解説

    2004

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    https://www.ice.tohtech.ac.jp/nakagawa/taylorexp/taylor1.htm

Teaching Experience

  • Analysis III

    2021.4 Institution:Tohoku Institute of Technology

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  • Analysis I

    2020.4 Institution:Tohoku Institute of Technology

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  • Analysis II and Excercises

    2017.9 Institution:Tohoku Institute of Technology

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  • ANalysisi I and excercises,

    2017.4 - 2019.8 Institution:Tohoku Institute of Technology

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  • 解析演習I,II

    2012.4 - 2017.3 Institution:東北工業大学

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  • 電磁気学Ⅱ

    2010.9 - 2011.3 Institution:東北工業大学

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  • 解析I及び同演習、解析II及び同演習

    2008.4 - 2012.3 Institution:東北工業大学

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  • 環境電磁工学特論

    2006 Institution:東北工業大学大学院

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  • Numerical Analysis

    2002.9 - 2022.3 Institution:Tohoku Institute of Technology

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  • 解析A,B

    2002.4 - 2008.3 Institution:東北工業大学

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  • コンピュータとプログラミングI

    2001 Institution:東北工業大学

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  • 環境電磁工学特論

    1996.4 - 1999.9 Institution:東北工業大学大学院

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  • 数値解析特論

    1995.4 - 2005.9 Institution:東北工業大学大学院

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  • プログラミングIA,IB

    1994.4 - 2001.3 Institution:東北工業大学

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  • 地球惑星科学

    1994.4 - 2000.8 Institution:東北工業大学

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  • コンピューター演習

    1994.4 - 1994.9 Institution:東北工業大学

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  • 電気数学I,II

    1993.9 - 2001.3 Institution:東北工業大学

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  • コンピューター基礎

    1993.9 - 1995.3 Institution:東北工業大学

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  • 情報通信工学実験III

    Institution:東北工業大学

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  • 現代科学総論

    Institution:東北工業大学

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Academic Activities