Laboratory Studies of the Lunar Surface Plasma Sheath and Methods for in situ Plasma Measurements

Details Laboratory Studies of the Lunar Surface Plasma Sheath and Methods for in situ Plasma Measurements Laboratory Studies of the Lunar Surface Plasma Sheath and Methods for in situ Plasma Measurements

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p51b0495w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P51B-0495

Physics

5415 Erosion And Weathering, 5465 Rings And Dust, 6015 Dust, 6250 Moon (1221)

Scientific paper

Surfaces in space exposed to plasmas and UV radiation will become charged and develop a sheath region with an electric field normal to the surface. Typically, this electric field is on the order of a few V/m, too small to lift-off micron sized grains with an expected charge of a single electron on the lunar surface, for example. Much higher electric fields can be generated due to differential UV charging between neighboring lit and dark surface elements, a common situation during sunset or sunrise. The moving lit/dark boundary can also lead to an increased surface charge density, which in combination with the strong localized electric field could lead to the mobilization and transport of the lunar soil. Here we report on a series of ongoing experiments to investigate differential photoelectron charging, and the so- called 'super-charging' effect, related to the moving boundaries between illuminated and dark surfaces. We will also discuss new plasma diagnostic methods to characterize the spatial and energy distribution of electrons in the dilute plasma sheath formed by UV generated emission on the lunar surface.

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