科技报告详细信息
Steady-State Solution of a Solar Wind-Generated Electron Cloud in a Lunar Crater
Rhodes, Dov J ; Farrell, W M
关键词: CHARGE DISTRIBUTION;    ELECTRON CLOUDS;    ELECTROSTATIC CHARGE;    LUNAR CRATERS;    LUNAR SURFACE;    PLASMAS (PHYSICS);    SOLAR WIND;    STEADY STATE;    WAKES;    WIND VELOCITY;   
RP-ID  :  GSFC-E-DAA-TN74168
学科分类:空间科学
美国|英语
来源: NASA Technical Reports Server
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【 摘 要 】

We formulate an analytic description of a steady-state electron cloud and affiliated surface charge, formed in the plasma wake generated as the solar wind flows horizontally over a lunar crater. The solution is complementary to the well-known self-similar plasma expansion formulation, which breaksdown at the plasma wake front and thus fails to capture a substantial region of the crater interior. The present model establishes a theoretical basis for existing simulation results, which suggest that the cavity formed below the wake front is populated mainly by electrons, resulting in a substantial negative surface charge. The electrostatic potential throughout this subwake region is determined by solving Poisson'sequation for a Maxwellian electron cloud, bounded above by the self-similar plasma expansion front and below by the electrostatically charged surface.

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