Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.p34a..03s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #P34A-03
Physics
6005 Atmospheres (1060), 6025 Interactions With Solar Wind Plasma And Fields, 6055 Surfaces, 6250 Moon (1221)
Scientific paper
The proposed sources for the Moon's diffuse exosphere include photon-stimulated desorption (PSD), ion sputtering and micrometeoroid impact vaporization. We have previously assessed the effects of ion surface impact on lunar sodium rates using ground-based observations of sodium emission which coincided with in-situ plasma data obtained by Lunar Prospector (June 7-16, 1998). We now extend this work to all published measurements unassociated with a known meteor shower. Daily averages of the solar UV flux and ion flux are employed as predictor variables for PSD and ion sputtering, correspondingly, while impact vaporization is assumed constant. Constrained regression techniques show that the primary effect of ion impact on the surface of the Moon is not direct sputtering but rather an enhancement of the PSD efficiency. A possible mechanism for this effect is ion-enhanced diffusion. The implications for the supply of exospheric volatile species of the Moon and Mercury will be discussed.
Killen Rosemary Margaret
Sarantos Menelaos
Slavin James Arthur
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