Relativistic electron precipitations in association with diffuse aurora: Conjugate observation of SAMPEX and the all-sky TV camera at Syowa Station

Satoshi Kurita, Akira Kadokura, Yoshizumi Miyoshi, Akira Morioka, Yuka Sato, Hiroaki Misawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

It has been believed that whistler mode waves can cause relativistic electron precipitations. It has been also pointed out that pitch angle scattering of ∼keV electrons by whistler mode waves results in diffuse auroras. Thus, it is natural to expect relativistic electron precipitations associated with diffuse auroras. Based on a conjugate observation between the SAMPEX spacecraft and the all-sky TV camera at Syowa Station, we report, for the first time, a case in which relativistic electron precipitations are associated with diffuse aurora. The SAMPEX observation shows that the precipitations of > 1 MeV electrons are well accompanied with those of > 150 and > 400 keV electrons. This indicates that electrons in the energy range from several keV to > 1 MeV precipitate into the atmosphere simultaneously. Our result supports the idea that whistler mode waves contribute to both generation of diffuse auroras and relativistic electron precipitations.

Original languageEnglish
Pages (from-to)4702-4708
Number of pages7
JournalGeophysical Research Letters
Volume42
Issue number12
DOIs
Publication statusPublished - 2015 Jun 28

Keywords

  • SAMPEX
  • Syowa Station
  • diffuse aurora
  • radiation belts
  • whistler mode wave

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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