Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

Y. Kazama, H. Kojima, Y. Miyoshi, Y. Kasahara, S. Kasahara, H. Usui, B. J. Wang, S. Y. Wang, S. W.Y. Tam, T. F. Chang, K. Asamura, Y. Kasaba, S. Matsuda, M. Shoji, A. Matsuoka, M. Teramoto, T. Takashima, I. Shinohara

Research output: Contribution to journalArticlepeer-review


This report describes electron beams observed at high latitudes in the magnetosphere by the Arase satellite. According to fine angular channel measurements, beam electrons are mainly flowing away from the Earth, and are well collimated to within a few degrees. A statistical study indicates that the beams are seen when Arase is located at Lm > ∼5, and more frequently as the magnetosphere becomes active. The field lines of the beam events are traced back to the typical auroral ovals. The statistical properties of the beams are consistent with the interpretation that ionospheric electrons are accelerated by a parallel electric field of an auroral potential structure and are streaming upward to the high latitude magnetosphere.

Original languageEnglish
Article numbere2020GL090522
JournalGeophysical Research Letters
Issue number5
Publication statusPublished - 2021 Mar 16

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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