[P-EM12] Space Weather and Space Climate

[PEM12-04] Different flux evolutions of relativistic electrons of the outer belt associated with high-speed coronal hole streams; Arase and Van Allen Probes observations

*三好 由純¹、栗田 怜¹、片岡 龍峰²、齊藤 慎司¹、Jordanova Vania³、篠原 育⁴、三谷 烈史⁴、高島 健⁴、東尾 奈々⁴、笠原 慧⁵、横田 勝一郎⁶、堀 智昭¹、桂華 邦裕⁵、笠原 禎也⁷、松田 昇也⁴、熊本 篤志⁸、土屋 史紀⁸、小路 真史¹、松岡 彩子¹、寺本 万里子¹、Spence Harlan⁹、Reeves Geoff³、Baker Daniel¹⁰ (1.名古屋大学宇宙地球環境研究所、2.国立極地研究所、3.ロスアラモス国立研究所、4.宇宙航空研究開発機構、5.東京大学、6.大阪大学、7.金沢大学、8.東北大学、9.ニューハンプシャー大学、10.コロラド大学)

キーワード：放射線帯、あらせ、太陽風-磁気圏相互作用

Relativistic and ultra-relativistic electrons increase largely during the high-speed coronal hole streams, and the enhanced flux levels are controlled by the solar wind speed and the prolonged southward IMF. Such flux enhancements associated with high-speed streams have been observed by Arase/HEP and XEP instruments as well as Van Allen Probes/MagEIS and REPT. Some coronal hole streams produce large flux enhancement of both relativistic and ultra-relativistic electrons, while other coronal holes produce large flux enhancement of relativistic electrons (~2 MeV) but do not produce enhancement of ultra-relativistic electrons. In this presentation, we will show evolutions of the energy spectrum of relativistic electrons during the coronal hole streams and discuss how evolutions of the energy spectrum are related to chorus wave activities that are derived from Arase/PWE measurements and the proxy data from the low-altitude satellite data.