Interaction between terrestrial plasma sheet electrons and the lunar surface: SELENE (Kaguya) observations

Yuki Harada, Shinobu MacHida, Yoshifumi Saito, Shoichiro Yokota, Kazushi Asamura, Masaki N. Nishino, Takaaki Tanaka, Hideo Tsunakawa, Hidetoshi Shibuya, Futoshi Takahashi, Masaki Matsushima, Hisayoshi Shimizu

研究成果: Contribution to journalArticle査読

11 被引用数 (Scopus)

抄録

Analysis of the data obtained by SELENE (Kaguya) revealed a partial loss in the electron velocity distribution function due to the "gyro-loss effect", namely gyrating electrons being absorbed by the lunar surface. The Moon enters the Earth's magnetosphere for a few days around full moon, where plasma conditions are significantly different from those in the solar wind. When the magnetic field is locally parallel to the lunar surface, relatively high-energy electrons in the terrestrial plasma sheet with Larmor radii greater than SELENE's orbital height strike the lunar surface and are absorbed before they can be detected. This phenomenon can be observed as an empty region in the electron distribution function, which is initially isotropic in the plasma sheet, resulting in a non-gyrotropic distribution. We observed the expected characteristic electron distributions, as well as an empty region that was consistent with the presence of a relatively strong electric field (∼10 mV/m) around the Moon when it is in the plasma sheet.

本文言語英語
論文番号L19202
ジャーナルGeophysical Research Letters
37
19
DOI
出版ステータス出版済み - 10 1 2010
外部発表はい

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球惑星科学(全般)

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