Noble gases in ancient asteroidal atmospheres

Details Noble gases in ancient asteroidal atmospheres Noble gases in ancient asteroidal atmospheres

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815069s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E8, p. 15,069-15,077.

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Asteroid Belts, Electromagnetic Fields, Planetary Atmospheres, Rare Gases, Regolith, Solar Wind, Atmospheric Composition, Ionizing Radiation, Rocks

Scientific paper

Analytical and numerical results presented here suggest that acceleration of photoions by the solar wind motional field is a significant loss process for Xe on asteroids about 200 km in radius or larger, if the Xe is thermalized by its interactions with the surface. For Ar, photoion acceleration can only become important for asteroids nearly 500 km in radius. Thus photoion acceleration, previously invoked for lunar samples, could be responsible for excess fission-produced Xe found associated with solar wind Xe in howarditic meteorites. The lack of such Xe in other types of meteorites may reflect either smaller parent bodies or later times of regolith exposure. Similarly, the failure to observe solar-wind-associated radiogenic Ar-40 in meteorites is consistent with the much smaller likelihood that Ar will be photoionized.

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