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

Research output: Contribution to journalArticle

11 Citations (Scopus)

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.

Original languageEnglish
Article numberL19202
JournalGeophysical Research Letters
Volume37
Issue number19
DOIs
Publication statusPublished - Oct 1 2010
Externally publishedYes

Fingerprint

lunar surface
plasma
electron
Moon
moon
electron distribution
electrons
distribution functions
interactions
Earth magnetosphere
Larmor radius
natural satellites
high energy electrons
solar wind
velocity distribution
magnetosphere
electric field
orbitals
electric fields
magnetic field

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Harada, Y., MacHida, S., Saito, Y., Yokota, S., Asamura, K., Nishino, M. N., ... Shimizu, H. (2010). Interaction between terrestrial plasma sheet electrons and the lunar surface: SELENE (Kaguya) observations. Geophysical Research Letters, 37(19), [L19202]. https://doi.org/10.1029/2010GL044574

Interaction between terrestrial plasma sheet electrons and the lunar surface : SELENE (Kaguya) observations. / Harada, Yuki; MacHida, Shinobu; Saito, Yoshifumi; Yokota, Shoichiro; Asamura, Kazushi; Nishino, Masaki N.; Tanaka, Takaaki; Tsunakawa, Hideo; Shibuya, Hidetoshi; Takahashi, Futoshi; Matsushima, Masaki; Shimizu, Hisayoshi.

In: Geophysical Research Letters, Vol. 37, No. 19, L19202, 01.10.2010.

Research output: Contribution to journalArticle

Harada, Y, MacHida, S, Saito, Y, Yokota, S, Asamura, K, Nishino, MN, Tanaka, T, Tsunakawa, H, Shibuya, H, Takahashi, F, Matsushima, M & Shimizu, H 2010, 'Interaction between terrestrial plasma sheet electrons and the lunar surface: SELENE (Kaguya) observations', Geophysical Research Letters, vol. 37, no. 19, L19202. https://doi.org/10.1029/2010GL044574
Harada, Yuki ; MacHida, Shinobu ; Saito, Yoshifumi ; Yokota, Shoichiro ; Asamura, Kazushi ; Nishino, Masaki N. ; Tanaka, Takaaki ; Tsunakawa, Hideo ; Shibuya, Hidetoshi ; Takahashi, Futoshi ; Matsushima, Masaki ; Shimizu, Hisayoshi. / Interaction between terrestrial plasma sheet electrons and the lunar surface : SELENE (Kaguya) observations. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 19.
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