Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmae31a0039a&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #AE31A-0039
Physics
2461 Plasma Interactions With Dust And Aerosols (7849), 5210 Planetary Atmospheres, Clouds, And Hazes (0343), 6213 Dust, 6914 Electromagnetic Noise And Interference, 7831 Laboratory Studies And Experimental Techniques
Scientific paper
It is well recognized that the charging properties of individual micron/sub-micron size dust grains by various processes are expected to be substantially different from the currently available measurements made on bulk materials. Solar UV radiation and the solar wind plasma charge micron size dust grains on the lunar surface with virtually no atmosphere. The electrostatically charged dust grains are believed to be levitated and transported long distances over the lunar terminator from the day to the night side. The current models do not fully explain the lunar dust phenomena and laboratory measurements are needed to experimentally determine the charging propertied of lunar dust grains. An experimental facility has been developed in the Dusty Plasma Laboratory at NASA- Marshall Space Flight Center for investigating the charging properties of individual micron/sub-micron size positively or negatively charged dust grains by levitating them in an electrodynamic balance in simulated space environments. In this paper, we present laboratory measurements on charging of Apollo 17 individual lunar dust grains by low energy electron beams in the 5-100 eV energy range. The measurements are made by levitating Apollo 17 dust grains of 0.2 to 10 um diameters, in an electrodynamic balance and exposing them to mono- energetic electron beams. The charging rates and the equilibrium potentials produced by direct electron impact and by secondary electron emission processes are discussed.
Abbas Merza
Dube Michael J.
Gaskin Jessica Anne
Spann James F.
Tankosic Dragana
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