Ion sputtering and radiolysis of ice at the Galilean moons

Details Ion sputtering and radiolysis of ice at the Galilean moons Ion sputtering and radiolysis of ice at the Galilean moons

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf...85p&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.85

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Scientific paper

In this work, starting from a previously developed MC model for the generation of Europa's exosphere, where the only considered species was water, we make a first attempt to simulate the more realistic O2 atmosphere of Europa. Due to radiolysis of ice and subsequent release of O2 molecules, considering a) a specific configuration where leading hemisphere coincides with sunlit hemisphere and b) the moon's surface temperature map, we estimate along the Europa-Sun line a column density of about 1.4 1015 cm-2 at the dayside and 2 1014 cm-2, at the nightside. We also make a more detailed estimation of the sputtered-water exosphere of this moon, taking into consideration the trailing-leading hemispheres asymetry in the magnetospheric ion bombardment. We compare the results of this analysis with those obtained by other models and with the in situ measurements and discuss them, in the context of future missions.

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