Study on nonlinear ion dynamics in electromagnetic ion cyclotron wave emissions

• Project/Area Number: 26800256
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Space and upper atmospheric physics
• Research Institution: Nagoya University
• Principal Investigator: Shoji Masafumi 名古屋大学, 宇宙地球環境研究所, 特任助教 (80722082)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 非線形波動粒子相互作用 / 地球内部磁気圏 / 計算機シミュレーション / 超高層物理学 / 電磁イオンサイクロトロン波動 / イオンハイブリッドシミュレーション

Outline of Final Research Achievements

We performed computer simulations on nonlinear interactions between electromagnetic ion cyclotron (EMIC) waves and high energy ions and relativistic electrons in the Earth's magnetosphere. The EMIC rising tone emissions with different spectrum characteristics are successfully reproduced in the simulations. The efficiency and time scale of the scattering and acceleration of protons are controlled by the wave spectra. The large amount of relativistic electrons with wide energy range are also scattered by the waves. We also performed the simulations with longitudinal electric fields, reproducing the EMIC falling tone emissions. We show that these plasma phenomena are conducted by the nonlinear wave particle interactions.

Research Products

• [Journal Article] Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes (2016)
  • Author(s): M. Ozaki, K. Shiokawa, Y. Miyoshi, R. Kataoka, S. Yagitani, T. Inoue, C.-W Jun, R. Nomura, K. Sakaguchi, Y. Otsuka, M. Shoji, I. Schofield, M. Connors, V. K. Jordanova
  • Journal Title: Geophysical Research Letters Volume: 43 Issue: 15 Pages: 7859-7866
  • DOI: 10.1002/2016gl070008
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electromagnetic ion cyclotron waves in the Earth's magnetosphere with a kappa-Maxwellian particle distribution (2015)
  • Author(s): Sugiyama, H., S. Singh, Y. Omura, M. Shoji, D. Nunn, and D. Summers
  • Journal Title: Journal of Geopysical Research, Space Physics Volume: 120 Issue: 10 Pages: 8426-8439
  • DOI: 10.1002/2015ja021346
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Sub-packet structures in EMIC triggered emissions observed by the THEMIS probes (2015)
  • Author(s): Nakamura, S., Y. Omura, M. Shoji, M. Nose, D. Summers, and V. Angelopoulos
  • Journal Title: Journal of Geopysical Research, Space Physics Volume: 120 Issue: 9 Pages: 7318-7330
  • DOI: 10.1002/2014ja020764
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Spectrum characteristics of electromagnetic ion cyclotron triggered emissions and associated energetic proton dynamics (2014)
  • Author(s): Shoji, M. and Y. Omura
  • Journal Title: J. Geophys. Res. Volume: 119 Pages: 3480-3489
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O+ ions (2014)
  • Author(s): Nose, M., K. Takahashi, K. Keika, L. M. Kistler, K. Koga, H. Koshiishi, H. Matsumoto, M. Shoji, Y. Miyashita, and R. Nomura
  • Journal Title: J. Geophys. Res. Volume: 119 Issue: 6 Pages: 1-17
  • DOI: 10.1002/2014ja019806
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Hybrid simulation of EMIC falling tone emissions (2016)
  • Author(s): Shoji, M. and Y. Omura
  • Organizer: AGU fall meeting
  • Place of Presentation: San Francisco, California
  • Year and Date: 2016-12-12
  • Int'l Joint Research
• [Presentation] Hybrid simulation of EMIC falling tone emissions (2016)
  • Author(s): Shoji, M. and Y. Omura
  • Organizer: SGEPSS, fall meeting
  • Place of Presentation: 福岡市、福岡県
  • Year and Date: 2016-11-19
• [Presentation] Simulation of nonlinear interaction between energetic plasmas and EMIC rising tone emissions (2016)
  • Author(s): Shoji, M and Y. Omura
  • Organizer: Japan Geoscience Union annual meeting
  • Place of Presentation: 千葉市、千葉県
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] Effects of electromagnetic ion cyclotron rising tone emissions on the magnetospheric plasmas (2015)
  • Author(s): 小路真史、大村善治
  • Organizer: AGU fall meeting 2015
  • Place of Presentation: Moscone Center, San Francisco, 米国
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] Effects of EMIC rising tone emissions on magnetospheric plasmas (2015)
  • Author(s): 小路真史、大村善治
  • Organizer: 第138回 SGEPSS 総会および講演会
  • Place of Presentation: 東京大学、東京
  • Year and Date: 2015-10-31
• [Presentation] Effects of EMIC rising tone emissions in the inner magnetosphere (2015)
  • Author(s): 小路真史、大村善治
  • Organizer: Asia Oseania Geosciences Society, 12th Annual Meeting
  • Place of Presentation: Suntec Singapore Convention & Exhibition Centre, シンガポール
  • Year and Date: 2015-08-05
  • Int'l Joint Research
• [Presentation] EMICトリガード放射が与える内部磁気圏高エネルギープラズマ環境への影響 (2015)
  • Author(s): 小路真史、大村善治
  • Organizer: Japan Geoscience Union Meeting
  • Place of Presentation: 幕張メッセ、千葉
  • Year and Date: 2015-05-24
  • Int'l Joint Research
• [Presentation] Simulations of EMIC rising tone emissions in the inner magnetosphere (2015)
  • Author(s): 小路真史、大村善治
  • Organizer: IWEPPINES
  • Place of Presentation: CEA, Campus TERATEC、フランス
  • Year and Date: 2015-05-21
  • Int'l Joint Research
• [Presentation] In-situ observations of nonlinear wave particle interaction of electromagnetic ion cyclotron waves (2014)
  • Author(s): Masafumi Shoji, Yoshizumi Miyoshi, Kunihiro Keika, Yuto Katoh, Vassilis Angelopoulos, Satoko Nakamura, and Yoshiharu Omura
  • Organizer: 第136回 SGEPSS総会および講演会
  • Place of Presentation: 松本
  • Year and Date: 2014-10-30 – 2014-11-03
• [Presentation] SPECTRUM CHARACTERISTICS OF ELECTROMAGNETIC ION CYCLOTRON TRIGGERED EMISSIONS AND ASSOCIATED ENERGETIC PROTON DYNAMICS (2014)
  • Author(s): 小路真史、大村善治
  • Organizer: Chapman Conference
  • Place of Presentation: チェジュ、韓国
  • Year and Date: 2014-09-01 – 2014-09-05
• [Presentation] SPECTRUM CHARACTERISTICS OF ELECTROMAGNETIC ION CYCLOTRON TRIGGERED EMISSIONS AND ASSOCIATED ENERGETIC PROTON DYNAMICS (2014)
  • Author(s): 小路真史、大村善治
  • Organizer: URSI General Assembly and Scientific Symposium
  • Place of Presentation: 北京、中国
  • Year and Date: 2014-08-18 – 2014-08-20
• [Presentation] Spectrum Characteristics of Electromagnetic Ion Cyclotron Triggered Emissions and Associated Energetic Proton Dynamics (2014)
  • Author(s): 小路真史、大村善治
  • Organizer: AOGS 11th Annual Meeting
  • Place of Presentation: 札幌
  • Year and Date: 2014-07-28 – 2014-08-01
  • Invited
• [Presentation] 電磁イオンサイクロトロン波動による非線形波動粒子相互作用 (2014)
  • Author(s): 小路真史、大村善治
  • Organizer: Japan Geoscience Union Meeting 2014
  • Place of Presentation: 横浜
  • Year and Date: 2014-04-28 – 2014-05-02
  • Invited