Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..131l&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.131
Physics
Scientific paper
We model the He exosphere, first at the Moon, in order to constrain the physics of its formation and of its dynamic then at Mercury to underline what can be stated on the origins of the observed He exosphere. Partial energy accommodation of the He particles when interacting a surface is constrained using Apollo 17 measurement. Neither a partial energy accommodation as suggested by [1] nor a total energy accommodation as suggested by [2] can fit the Mercury's observations at nightside. The Lunar observations suggest that He atoms interact more than one time with the surface when they reimpact it. The present observations do not allow constraining the energy distributions of these particles when ejected or rejected. There remain significant unexplained features in Mercury's He exosphere. Any new observation on the diurnal variations of these exospheres or on the local altitude profiles would greatly help to further constrain the exospheresurface interaction.
Chaufray Jean-Yves
LeBlanc Francis
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