Relativistic electron precipitation at International Space Station: Space weather monitoring by Calorimetric Electron Telescope

Ryuho Kataoka, Yoichi Asaoka, Shoji Torii, Toshio Terasawa, Shunsuke Ozawa, Tadahisa Tamura, Yuki Shimizu, Yosui Akaike, Masaki Mori

Research output: Contribution to journalArticle

7 Citations (Scopus)


The charge detector (CHD) of the Calorimetric Electron Telescope (CALET) on board the International Space Station (ISS) has a huge geometric factor for detecting MeV electrons and is sensitive to relativistic electron precipitation (REP) events. During the first 4 months, CALET CHD observed REP events mainly at the dusk to midnight sector near the plasmapause, where the trapped radiation belt electrons can be efficiently scattered by electromagnetic ion cyclotron (EMIC) waves. Here we show that interesting 5-20 s periodicity regularly exists during the REP events at ISS, which is useful to diagnose the wave-particle interactions associated with the nonlinear wave growth of EMIC-triggered emissions.

Original languageEnglish
Pages (from-to)4119-4125
Number of pages7
JournalGeophysical Research Letters
Issue number9
Publication statusPublished - 2016 May 16



  • electromagnetic ion cyclotron waves
  • International Space Station
  • radiation belt
  • relativistic electrons
  • space weather forecast

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

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