Spreading of Saturn's Neutral Torus

Details Spreading of Saturn's Neutral Torus Spreading of Saturn's Neutral Torus

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm32b..07c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM32B-07

Physics

[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings

Scientific paper

The H2O vapor ejected from Enceladus' south pole forms a Saturn-encircling cloud of neutrals and plasma. Two decades of OH cloud modeling and observations suggested that H2O, and its dissociation and ionization products are spread throughout the Saturnian system primarily by magnetospheric plasma/neutral interactions (e.g., Johnson et al., APJ, 2006). In recent years, Cassini UVIS data has shown even broader O and H clouds that are not reproduced by previous models. Using a Direct Simulation Monte Carlo model of the neutral cloud we have found that the neutral-neutral collisions are key to explaining the unexpected breadth of the O cloud (See also: Farmer, Icarus, 2009). We will also discuss the cloud's curious H2O maser emission (Pogrebenko et al., 2009), which, we hypothesize, is a consequence of electron impact excitation.

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