電磁イオンサイクロトロン波動によるイオン散乱に対する電離圏の効果

2023 年度 実施状況報告書

• 研究課題/領域番号: 22KF0167
• 配分区分: 基金
• 研究機関: 名古屋大学
• 研究代表者: 三好 由純 名古屋大学, 宇宙地球環境研究所, 教授 (10377781)
• 研究分担者: PORUNAKATU SHREEDEVI 名古屋大学, 宇宙地球環境研究所, 外国人特別研究員
• 研究期間 (年度): 2023-03-08 – 2025-03-31
• キーワード: simulation / inner magnetosphere / ring current / plasma waves

研究実績の概要

RAM-SCB simulations were conducted to understand the impact of proton precipitation caused by wave-particle interactions on the ionospheric dynamics during geomagnetic stormtime. The simulations show that localized proton precipitation resulting from EMIC waves resulted in localized enhancement of conductivity in the evening side. This further gave rise to high speed westward flow in the ionosphere similar to the Subauroral Polarization Streams (SAPS). The study further highlights the importance of proton precipitation in modulating the ionospheric dynamics. Additionally, the sources and mechanisms of generation of EMIC waves in the inner magnetosphere during periods of solar wind dynamic pressure enhancement and their subsequent impact on the ionosphere are studied using the satellite/ground measurements.

現在までの達成度 (区分)

3: やや遅れている

理由

We encountered some challenges while integrating WPI into the standalone RAM-SCB. We will continue our data-model comparison as soon as we resolve the issues with the integration of WPI in the model. We're in the process of preparing a manuscript for the simulation study on SAPS.

今後の研究の推進方策

The results of the simulation study conducted to understand the impact of proton precipitation on the ionospheric dynamics will be submitted to Geophysical Research Letters. The results will also be presented in the upcoming conferences (AGU, SGEPSS).
As for the second study on the mechanisms of generation of EMIC waves in the inner magnetosphere during periods of solar wind dynamic pressure enhancement and their subsequent impact on the ionosphere, the data analysis is complete. The simulation results from the model will be compared with the satellite and ground-based measurements.

次年度使用額が生じた理由

予定していた出張を見合わせたため次年度使用が生じたが、次年度に成果発表のための出張を行う予定である。

研究成果

• [雑誌論文] Plasma Pressure Distribution of Ions and Electrons in the Inner Magnetosphere During CIR Driven Storms Observed During Arase Era (2023)
  • 著者名/発表者名: Kumar Sandeep、Miyoshi Y.、Jordanova V. K.、Kistler L. M.、Park I.、Jun C.、Hori T.、Asamura K.、Shreedevi P. R.、Yokota S.、Kasahara S.、Kazama Y.、Wang S.‐Y.、Tam Sunny W. Y.、Chang Tzu‐Fang、Mitani T.、Higashio N.、Keika K.、Matsuoka A.、Imajo S.、Shinohara I.
  • 雑誌名: Journal of Geophysical Research: Space Physics 巻: 128 ページ: -
  • DOI: 10.1029/2023JA031756
  • 査読あり / 国際共著
• [学会発表] On the EMIC wave activity in the inner magnetosphere associated with solar wind dynamic pressure variations (2023)
  • 著者名/発表者名: Shreedevi P R, Yoshizumi Miyoshi, Yiqun Yu, Vania Jordanova, Xingbin Tian, Chae-Woo Jun, Kazuo Shiokawa, Masafumi Shoji, Satoko Nakamura
  • 学会等名: Japan Geoscience Union Meeting 2023
  • 国際学会
• [学会発表] Proton precipitation at sub-auroral latitudes and its association to EMIC waves: Global modeling and multi instrument observations (2023)
  • 著者名/発表者名: Shreedevi P R, Yiqun Yu, Yoshizumi Miyoshi, Xingbin Tian, Sandeep Kumar, Minghui Zhu, Satoko Nakamura, Chae-Woo Jun, Masafumi Shoji, Kazuo Shiokawa, Vania Jordanova, T. Hori, K.Asamura, I. Shinohara, S. Yokota, S. Kasahara, K.Keika, A. Matsuoka , Martin Connors, Akira Kadokura
  • 学会等名: URSI
  • 国際学会
• [学会発表] Monitoring the ionospheric dynamics over the Indian Antarctic Research Station, Bharati : Progress and future plans (2023)
  • 著者名/発表者名: Shreedevi P R, R K Choudhary, Sunil R, Yoshizumi Miyoshi
  • 学会等名: URSI
  • 国際学会
• [学会発表] Morphology of the ionospheric scintillations over the southern polar cusp station (2023)
  • 著者名/発表者名: Shreedevi P R, R K Choudhary, Sunil R, Yoshizumi Miyoshi
  • 学会等名: NIPR Symposium
• [学会発表] EMIC wave activity in the inner magnetosphere associated with solar wind dynamic pressure variations: Global modeling and observations (2023)
  • 著者名/発表者名: Shreedevi P R, Yoshizumi Miyoshi, Yiqun Yu, Vania Jordanova, Xingbin Tian, Chae-Woo Jun, Kazuo Shiokawa, Masafumi Shoji, Satoko Nakamura
  • 学会等名: AGU Fall meeting
  • 国際学会