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

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摘要

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.

原文English
文章編號e2020GL090522
期刊Geophysical Research Letters
48
發行號5
DOIs
出版狀態Published - 2021 3月 16

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球與行星科學(全部)

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