Estimate of the neutral atoms' contribution to the Mercury exosphere caused by a new flux of micrometeoroids

Author： Borin P.   Bruno M.   Cremonese G.   Marzari F.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|517|issue|A89-A89

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.517, Iss.issue, 2010-08, pp. : A89-A89

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Abstract

Context. The planet Mercury has an extended and tenuous exosphere made up of atoms that are ejected from the surface by energetic processes, including hypervelocity micrometeoritic impacts, photon-stimulated desorption by UV radiation, and ion sputtering. The well known constituents of the Hermean exosphere are H, He, O, Na, K, and Ca but, from the new MESSENGER data from flybys, many others elements are expected, as for instance Mg.

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