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Title: Interaction between terrestrial plasma sheet electrons and the lunar surface: SELENE (Kaguya) observations
Authors: Harada, Yuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Machida, Shinobu
Saito, Yoshifumi
Yokota, Shoichiro
Asamura, Kazushi
Nishino, Masaki N.
Tanaka, Takaaki  kyouindb  KAKEN_id  orcid (unconfirmed)
Tsunakawa, Hideo
Shibuya, Hidetoshi
Takahashi, Futoshi
Matsushima, Masaki
Shimizu, Hisayoshi
Author's alias: 原田, 裕己
Keywords: Moon
Issue Date: Oct-2010
Publisher: American Geophysical Union
Journal title: Geophysical Research Letters
Volume: 37
Issue: 19
Thesis number: L19202
Abstract: 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.
Rights: ©2010. American Geophysical Union.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1029/2010GL044574
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