内部磁気圏における高エネルギー荷電粒子とプラズマ波動の研究

2023 年度 実施状況報告書

• 研究課題/領域番号: 22KF0169
• 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: KUMAR SANDEEP 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: inner magnetosphere / ring current / electrons / Arase satellite / simulation

研究実績の概要

The objective of this research proposal is to investigate the wide range of energies (from keV to MeV) plasma and waves in the inner magnetosphere using observation from Arase satellite. Using the Arase satellite data for corotating interaction regions driven magnetic storms, we investigated statistically the spatial and temporal plasma pressure distribution of ions and electrons in the inner magnetosphere. Our study highlighted the importance of electron pressure to the ring current in dawn sector during moderate magnetic storms. The contribution of electron to the ring current has not been investigated much earlier. Our results indicate an important role of electrons in the ring current build up. It can help in the accuracy of the future models of ring current and space weather studies.

現在までの達成度 (区分)

3: やや遅れている

理由

We investigated statistically moderate storms observed during Arase era (2017-2021) during solar minima. However, recently (2022 onwards) Arase observed many intense geomagnetic storms due to solar maxima. Therefore, we have a unique opportunity to study and compare the energetic particles in inner magnetosphere during different solar activity.

今後の研究の推進方策

Plasma pressure of ions and electrons in the inner magnetosphere plays an important role in plasma dynamics and generation of electric currents. The knowledge of plasma pressure in the inner magnetosphere is important as it reflects the source, transport and loss of different ions and electrons population. Earlier we established and published results of energetic particles in the inner magnetosphere during low solar activity. Recently, as solar activity increases, Arase observed many intense magnetic storms. Therefore, it will be very important to understand the inner magnetospheric evolution during different phases of solar activity. We will investigate and finalize the comparative study using Arase observations.

次年度使用額が生じた理由

予定していた出張を取りやめたが、次年度に成果発表の出張を実施する予定である。

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
• [学会発表] Statistical analysis of pressure and temperature distribution of ions and electrons in the inner magnetosphere during CIR and CME driven storms observed by Arase satellite (2023)
  • 著者名/発表者名: Kumar Sandeep,Miyoshi Yoshizumi,Vania Jordanova,Kistler L M, Asamura Kazushi,Yokota Shoichiro,Kasahara Satoshi,Kazama Yoichi,S-Y Wang,Sunny W Y TAM,Mitani Takefumi,N Higashio,Keika Kunihiro,Hori Tomoaki,Jun Chae Woo,Matsuoka Ayako,Imajo Shun,Shinohara Iku
  • 学会等名: SGEPSS
• [学会発表] 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.
  • 学会等名: American Geophysical Union (AGU) Fall Meeting
  • 国際学会