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

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

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3719202h&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 19, CiteID L19202

Physics

Plasma Physics

Planetary Sciences: Solar System Objects: Moon (1221), Planetary Sciences: Solid Surface Planets: Interactions With Particles And Fields, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Electrostatic Structures, Magnetospheric Physics: Plasma Sheet

Scientific paper

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.

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