内部磁気圏ＥＭＩＣ波動を用いた超熱的エネルギーイオン分布の解明と将来観測への応用

2017 Fiscal Year Annual Research Report

• Project/Area Number: 16J02163
• Research Institution: Nagoya University
• Principal Investigator: 松田 昇也 名古屋大学, 宇宙地球環境研究所, 特別研究員(PD)
• Project Period (FY): 2016-04-22 – 2019-03-31
• Keywords: あらせ / ERG / PWE / 電磁イオンサイクロトロン波動 / 内部磁気圏

Outline of Annual Research Achievements

本年度は，2016年に打ち上げられたジオスペース探査衛星ERG（あらせ）に搭載したプラズマ波動観測器PWEによって取得されたデータを用いて，内部磁気圏で発生する電磁イオンサイクロトロン（EMIC）波動の観測例を収集した．観測された電磁界波形データを網羅的に周波数解析し，約一年間の定常観測期間におよそ200例の観測例があることを明らかにした．また，観測された電磁イオンサイクロトロン（EMIC）波動のダイナミックスペクトルに現れる微細構造（周期的に表れる周波数変動）の有無に着目し，大別される2種類の電磁イオンサイクロトロン（EMIC）波動の発生頻度分布の違いなどを議論した．その結果，磁気緯度毎・磁気地方時毎の発生頻度分布が微細構造の有無によって異なることが分かった．これらの違いは，2種類の電磁イオンサイクロトロン（EMIC）波動が発生する条件が異なることに由来していると考えられる．また，磁気緯度方向の分布の解明は，ERG（あらせ）の軌道が，磁気赤道域のみではなく低～中緯度帯まで観測可能であるために実現できた．他の衛星では実現不可能な観測であり，本研究ならではのユニークな成果であるといえる．本研究で得られた成果をもとに，観測されたEMIC波動の特性周波数解析を進め，大別された異なる特徴を持つ電磁イオンサイクロトロン（EMIC）波動の励起条件と，背景の超熱的エネルギーイオンの関係を明らかにしていくことが，内部磁気圏のプラズマ環境変動を紐解く鍵と成り得る．

Research Progress Status

翌年度、交付申請を辞退するため、記入しない。

Strategy for Future Research Activity

翌年度、交付申請を辞退するため、記入しない。

Research Products

• [Journal Article] Onboard Software of Plasma Wave Experiment aboard Arase: Instrument Management and Signal Processing of Waveform Capture/Onboard Frequency Analyzer (2018)
  • Author(s): Matsuda, S., Y. Kasahara, H. Kojima, Y. Kasaba, S. Yagitani, M. Ozaki, T. Imachi, K. Ishisaka, A. Kumamoto, F. Tsuchiya, M. Ota, S. Kurita, Y. Miyoshi, M. Hikishima, A Matsuoka, and I. Shinohara
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-018-0838-0
  • Peer Reviewed / Open Access
• [Journal Article] The Plasma Wave Experiment (PWE) on board the Arase (ERG) Satellite (2018)
  • Author(s): Kasahara, Y., Y. Kasaba, H. Kojima, S. Yagitani, K. Ishisaka, A. Kumamoto, F. Tsuchiya, M. Ozaki, S. Matsuda, T. Imachi, Y. Miyoshi, M. Hikishima, Y. Katoh, M. Ota, M. Shoji, A. Matsuoka, and I. Shinohara
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-018-0842-4
  • Peer Reviewed / Open Access
• [Journal Article] Magnetic Search Coil (MSC) of Plasma Wave Experiment (PWE) aboard the Arase (ERG) satellite (2018)
  • Author(s): Ozaki, M., S. Yagitani, Y. Kasahara, H. Kojima, Y. Kasaba, A. Kumamoto, F. Tsuchiya, S. Matsuda, A. Matsuoka, T. Sasaki, and T. Yumoto
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-018-0837-1
  • Peer Reviewed / Open Access
• [Journal Article] Software-type Wave-Particle Interaction Analyzer on board the Arase satellite (2018)
  • Author(s): Katoh, Y., H. Kojima, M. Hikishima, T. Takashima, K. Asamura, Y. Miyoshi, Y. Kasahara, S. Kasahara, T. Mitani, N. Higashio, A. Matsuoka, M. Ozaki, S. Yagitani, S. Yokota, S. Matsuda, M. Kitahara, and I. Shinohara
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-017-0771-7
  • Peer Reviewed / Open Access
• [Journal Article] Electron scattering by chorus waves generating pulsating auroras (2018)
  • Author(s): Kasahara, S., Y. Miyoshi, S. Yokota, T. Mitani, Y. Kasahara, S. Matsuda, A. Kumamoto, A. Matsuoka, Y. Kazama, H. U. Frey, V. Angelopoulos, S. Kurita, K. Keika, K. Seki, and I. Shinohara
  • Journal Title: Nature Volume: 554 Pages: 337-340
  • DOI: 10.1038/nature25505
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft (2018)
  • Author(s): Kumamoto, A., F. Tsuchiya, Y. Kasahara, Y. Kasaba, H. Kojima, S. Yagitani, K. Ishisaka, T. Imachi, M. Ozaki, S. Matsuda, M. Shoji, A. Matsuoka, Y. Katoh, Y. Miyoshi, and T. Obara
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-018-0854-0
  • Peer Reviewed / Open Access
• [Journal Article] Data processing in Software-type Wave-Particle Interaction Analyzer onboard the Arase satellite (2018)
  • Author(s): Hikishima, M., H. Kojima, Y. Katoh, Y. Kasahara, S. Kasahara, T. Mitani, N. Higashio, A. Matsuoka, Y. Miyoshi, K. Asamura, T. Takashima, S. Yokota, M. Kitahara, and S. Matsuda
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-018-0856-y
  • Peer Reviewed / Open Access
• [Journal Article] Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite (2017)
  • Author(s): Kasaba, Y., K. Ishisaka, Y. Kasahara, T. Imachi, S. Yagitani, H. Kojima, S. Matsuda, M. Shoji, S. Kurita, T. Hori, A. Shinbori, M. Teramoto, Y. Miyoshi, T. Nakagawa, N. Takahashi, Y. Nishimura, A. Matsuoka, A. Kumamoto, F. Tsuchiya, and R. Nomura
  • Journal Title: Earth Planets Space Volume: 0 Pages: 0
  • DOI: 10.1186/s40623-017-0760-x
  • Peer Reviewed / Open Access
• [Presentation] Statistical Analysis of EMIC Waves Observed by Plasma Wave Experiment (PWE) aboard Arase (2018)
  • Author(s): Matsuda, S., Y. Kasahara, Y. Miyoshi, R. Nomura, S. Kurita, M. Teramoto, Y. Kasaba, K. Ishisaka, M. Shoji, A. Matsuoka
  • Organizer: AOGS 15th Annual Meeting
  • Int'l Joint Research
• [Presentation] Strategy of EMIC Wave Observation by Arase/PWE and its Initial Results (2018)
  • Author(s): Matsuda, S., Y, Kasaba, M. Shoji, M. Teramoto, S. Kurita, Y. Miyoshi, A. Matsuoka, Y. Kasahara, K. Ishisaka, Keigo, R. Nomura
  • Organizer: AT-RASC 2018
  • Int'l Joint Research / Invited
• [Presentation] Onboard Processing on Plasma Wave Experiment (PWE) aboard the Arase Satellite (2018)
  • Author(s): Matsuda, S., Y. Kasahara, H. Kojima, Y. Kasaba, S. Yagitani, M. Ozaki, T. Imachi, K. Ishisaka, A. Kumamoto, F. Tsuchiya, M. Ota, S. Kurita, Y. Miyoshi, M. Hikishima, A. Matsuoka, I. Shinohara
  • Organizer: PIERS 2018
  • Int'l Joint Research
• [Presentation] Statistical Analysis of EMIC Waves Observed by Plasma Wave Experiment (PWE) aboard Arase (2018)
  • Author(s): Matsuda, S., Y. Kasahara, Y. Miyoshi, R. Nomura, S. Kurita, M. Teramoto, Y. Kasaba, K. Ishisaka, M. Shoji, A. Matsuoka
  • Organizer: JpGU-AGU Joint Meeting 2018
  • Int'l Joint Research
• [Presentation] Initial Report of the Onboard Frequency Analyzer/Waveform Capture (OFA/WFC) on board the ERG(ARASE) Satellite and its Calibration Technique (2017)
  • Author(s): Shoya Matsuda, Yoshiya Kasahara, Hirotsugu Kojima, Yasumasa Kasaba, Tomohiko Imachi, Mitsunori Ozaki, Satoshi Yagitani, Keigo Ishisaka, Atsushi Kumamoto, Fuminori Tsuchiya, Mamoru Ota, Yoshizumi Miyoshi, Ayako Matsuoka, Mitsuru Hikishima, and Iku Shinohara
  • Organizer: 32nd URSI GASS
  • Int'l Joint Research
• [Presentation] Onboard Processing on PWE OFA/WFC (Onboard Frequency Analyzer/Waveform Capture) aboard the ERG (ARASE) Satellite (2017)
  • Author(s): Shoya Matsuda, Yoshiya Kasahara, Hirotsugu Kojima, Yasumasa Kasaba, Satoshi Yagitani, Mitsunori Ozaki, Tomohiko Imachi, Keigo Ishisaka, Satoshi Kurita, Mamoru Ota, Atsushi Kumamoto, Fuminori Tsuchiya, Miyoshi Yoshizumi, Ayako Matsuoka, Mariko Teramoto and Iku Shinohara
  • Organizer: GU Fall Meeting 2017
  • Int'l Joint Research
• [Presentation] Onboard Processing on PWE OFA/WFC (Onboard Frequency) Analyzer/Waveform Capture) aboard the ERG(ARASE) Satellite (2017)
  • Author(s): Shoya Matsuda, Yoshiya Kasahara, Hirotsugu Kojima, Yasumasa Kasaba, Satoshi Yagitani, Mitsunori Ozaki, Tomohiko Imachi, Keigo Ishisaka, Mamoru Ota, Atsushi Kumamoto, Fuminori Tsuchiya, Yoshizumi Miyoshi, Ayako Matsuoka, Iku Shinohara
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Initial Results of Polarization Analyses and Direction Finding of Plasma Waves via the Continuous Cross-Spectrum Measurement by Arase/PWE (2017)
  • Author(s): S. Matsuda, Y. Kasahara, H. Kojima, Y. Kasaba, S. Yagitani, M. Ozaki, T. Imachi, K. Ishisaka, S. Kurita, M. Ota, Y. Miyoshi, A. Matsuoka and I. Shinohara
  • Organizer: 地球電磁気・地球惑星圏学会