Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm32b..06d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM32B-06
Physics
[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6275] Planetary Sciences: Solar System Objects / Saturn, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites
Scientific paper
The Cassini E3 and E5 encounters with Enceladus probed the south polar dust plume, where the Ion and Neutral Mass Spectrometer (INMS) measured neutral H2O molecular densities up to 108 cm-3. A previous model for the water vapor density in the plume assumed a spherical expansion from a source at the south pole. We have constructed an alternative model that assumes a southward flowing Maxwellian velocity distribution at the south pole source. If we set the Mach number (flow speed over thermal speed) to have a value ~ 2-3, the model produces a plume-like particle distribution over the south pole which resembles the ISS dust images. We are comparing the model predictions with INMS observations of neutral H2O density along the E2, E3, and E5 trajectories in order to determine the best fit value of the Mach number and the total source rate. So far we have a good fit value of 2-3 for the Mach number and 1026 - 1027 molecules/sec for the source rate. This work is still in progress.
Dong Yu-bing
Hill Thomas W.
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