日本地球惑星科学連合2023年大会

講演情報

[E] オンラインポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM09] Space Weather and Space Climate

2023年5月26日(金) 10:45 〜 12:15 オンラインポスターZoom会場 (2) (オンラインポスター)

コンビーナ:片岡 龍峰(国立極地研究所)、Antti A Pulkkinen(NASA Goddard Space Flight Center)、Mary Aronne中村 紗都子(名古屋大学宇宙地球環境研究所)

現地ポスター発表開催日時 (2023/5/25 17:15-18:45)

10:45 〜 12:15

[PEM09-P13] Cause and Effects of Relativistic Electron Precipitation at CALET onboard ISS

*Ryuho Kataoka1、A. Bruno2,3、L. Blum4、G. A. de Nolfo2、S. Nakahira5Shoko Miyake6、S. Torii7 (1.National Institute of Polar Research、2.NASA/GSFC、3.Catholic University of America、4.University of Colorado Boulder、5.JAXA/ISAS、6.Ibaraki College、7.Waseda University)

キーワード:relativistic electron precipitation, radiation dose, radiation belts

Relativistic electron precipitation (REP) events observed by CALET-CHD instrument at the International Space Station (ISS, orbiting ~400 km altitude) have been interpreted as the manifestation of the wave-particle interaction between electromagnetic ion cyclotron (EMIC) waves and trapped MeV electrons (Kataoka et al., 2016, GRL). From the space weather point-of-view, this presentation will address following questions by reviewing our recent papers: 1) Exposure dose during extravehicular activities on the ISS? 2) Effects on the disappearance of radiation belt MeV electrons? 3) EMIC waves a dominant cause of REP events? Our answers to these questions are: 1) From the quantitative evaluation of the exposure dose during EVA on the ISS, using the MeV electron flux data during REP events, there is no need to be overly concerned (Ueno et al., 2019, Space Weather). 2) Conjunction observations with the Van Allen Probe suggest that a major MeV electron drop-out event was caused by both REP events and the magnetopause shadowing effect at different positions (Bruno et al., 2021, GRL). 3) The plasma waves that caused the REP events were investigated by the conjunction observations with the Arase satellite, and the contribution of whistler mode waves was also clearly identified (Kataoka et al., 2020, JGR Space Physics). The CALET-CHD data are available from ISAS-DARTS. A new web interface for viewing the data is also available here (https://app.darts.isas.jaxa.jp/timeseries/d/lZxZIHSLri4zasawa/maxicalet_bin?orgId=5).
In this presentation, we will also introduce the latest space weather-related activities using CALET-CHD data.