Surface charging of Saturn's moon Rhea

Details Surface charging of Saturn's moon Rhea Surface charging of Saturn's moon Rhea

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11c1757j&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11C-1757

Physics

[6280] Planetary Sciences: Solar System Objects / Saturnian Satellites

Scientific paper

We report on CAPS electron spectrometer observations made during the Cassini spacecraft's close encounter with Saturn's second-largest moon, Rhea, on March 2, 2010. During the flyby, Cassini passed within 101 km of the north polar region of the satellite. CAPS-ELS had good pitch angle coverage during the encounter, with its 8 anodes covering directions from south towards the moon’s surface to north, away from the moon. When on magnetic field lines connected directly to the moon's surface, in anodes directed towards the moon, ELS observed the expected decrease in the high energy electron population caused by their absorption by Rhea, but also observed an enhancement in the population of electrons at energies below a few hundred eV. We present our interpretation of this population as being associated with the surface charging of Rhea.

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