Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23d..05t&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM23D-05
Physics
[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5422] Planetary Sciences: Solid Surface Planets / Ices, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites
Scientific paper
Measurements of Rhea's sputter-produced O2 and CO2 exosphere during the Cassini spacecraft's March 2, 2010 and January 11, 2011 low-altitude polar flybys have yielded a unique up close characterization of the exospheric physics. Data from the Ion Neutral Mass Spectrometer shows spatial and temporal variability consistent with a diurnal and seasonal exosphere, with the O2 and CO2 vapor pressures declining in response to Rhea's transition from equinox into southern winter. The implied surface cryotrapping efficiency suggests possible downward percolation and storage of transiently adsorbed gas at depth in the ice regolith, perhaps resulting in a seasonal lag in the exospheric density and distribution. We will discuss these results in the context of observations by Cassini's other plasma instruments to form a detailed picture of the surface-exospheric-magnetospheric interaction. Finally, we will preview questions and expectations for the upcoming December 12, 2011 Dione encounter.
Teolis B. D.
Waite H. Jr. J..
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