Neutral H2O density and the jet features in the Enceladus plume

Details Neutral H2O density and the jet features in the Enceladus plume Neutral H2O density and the jet features in the Enceladus plume

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p33a1564d&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P33A-1564

Physics

Plasma Physics

[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites, [7837] Space Plasma Physics / Neutral Particles

Scientific paper

Cassini’s encounters with Enceladus in 2008 and 2009, E3, E5 and E7, probed the south polar dust plume and produced exciting INMS measurements of the neutral H2O density. Of all these encounters, E7 had the closest approach to the Enceladus south pole, and it is the first time that INMS directly detected the jet features in the plume. We have constructed a model for the water density in the plume derived from a supersonic radial outflow from one or more of the surface vents. Our model predictions fit well with the INMS measurements of neutral H2O density along the E3, E5 and E7 trajectories (Teolis et al., 2010), and gives reasonable fit values of the flow velocity from the sources and the total source rate of H2O. By applying our multiple-source model to the possible source locations on the surface in the south polar region suggested by Spitale and Porco (2007), it fits well with the multiple peaks in E7 INMS data, which could represent the multiple jet features in the plume. We also discuss the possible sources accounting for these jets according to our fitting. The study of possible effects on Saturn’s magnetosphere is still in progress, and may also be included in the paper.

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