The Enceladus Neutral Cloud and the OH Torus

Details The Enceladus Neutral Cloud and the OH Torus The Enceladus Neutral Cloud and the OH Torus

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p24a..04j&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P24A-04

Physics

5737 Magnetospheres (2756), 5759 Rings And Dust, 6063 Volcanism (5480, 8450), 6280 Saturnian Satellites

Scientific paper

Following the discovery of venting of water vapor from Enceladus, we examined the contribution of this source to the neutral OH torus that was observed by HST. Preliminary analysis of Cassini data suggests that the Enceladus source rate is comparable to the "missing source" required to explain HST observations, which S. Jurac and co-workers estimate at ~ 1027-1028 H2O s-1. However, the radial distribution of the OH torus and the Enceladus neutral cloud differ considerably, unless one includes the interaction of the Enceladus cloud with the ambient plasma and/or accounts for water molecules ejected from the emitted grains. Here we describe the emission of water vapor from Enceladus, the formation of its neutral cloud and its redistribution by charge exchange as described by Johnson and co-workers. We also examine the emitted grains as a potential source of water vapor at some distance from Enceladus. We compare the resulting Enceladus cloud to the most recent model for the OH torus observed by HST.

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