Investigation of dust transport on the lunar surface in laboratory plasmas

Details Investigation of dust transport on the lunar surface in laboratory plasmas Investigation of dust transport on the lunar surface in laboratory plasmas

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p32a..06w&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P32A-06

Physics

Plasma Physics

[6213] Planetary Sciences: Solar System Objects / Dust, [6250] Planetary Sciences: Solar System Objects / Moon, [7831] Space Plasma Physics / Laboratory Studies And Experimental Techniques, [7849] Space Plasma Physics / Plasma Interactions With Dust And Aerosols

Scientific paper

There has been much evidence indicating dust levitation and transport on or near the lunar surface. Dust mobilization is likely to be caused by electrostatic forces acting on small lunar dust particles that are charged by UV radiation and solar wind plasma. To learn about the basic physical process, we investigated the dynamics of dust grains on a conducting surface in laboratory plasmas. The first experiment was conducted with a dust pile (JSC-Mars-1) sitting on a negatively biased surface in plasma. The dust pile spread and formed a diffusing dust ring. Dust hopping was confirmed by noticing grains on protruding surfaces. The electrostatic potential distributions measured above the dust pile show an outward pointing electrostatic force and a non-monotonic sheath above the dust pile, indicating a localized upward electrostatic force responsible for lifting dust off the surface. The second experiment was conducted with a dust pile sitting on an electrically floating conducting surface in plasma with an electron beam. Potential measurements show a horizontal electric field at the dust/surface boundary and an enhanced vertical electric field in the sheath above the dust pile when the electron beam current is set to be comparable to the Bohm ion current. Secondary electrons emitted from the surfaces play an important role in this case.

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