The Cassini Enceladus encounters in the view of energetic particle measurements

Details The Cassini Enceladus encounters in the view of energetic particle measurements The Cassini Enceladus encounters in the view of energetic particle measurements

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11c1766k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11C-1766

Physics

[6280] Planetary Sciences: Solar System Objects / Saturnian Satellites

Scientific paper

The moon Enceladus embedded in Saturn's radiation belts in the inner magnetosphere is the main internal source of charged particles in this outer planet's system. A plume of water molecules released through geysirs on the south polar region provide enough material to feed the E-ring of Saturn and the entire magnetosphere. In the time period 2005-2010 the Cassini spacecraft flew close by the moon ten times, some of them as low as 25 km above the surface and directly through the plume. For the very first time measurements of energetic particle signatures inside the plume and close by in the magnetosphere could be obtained. Features in the data indicated that the spacecraft was connected to the plume material along field lines way before entering the high density region of the plume. Absorption signatures in the loss of energetic electrons bouncing along those field lines clearly show an energy dependence from which density calculations might be possible. During one of the flybys the presence of dust in the energetic particle data offers the opportunity to nicely correlate those results with onboard dust measurements of the cosmic dust analyzer CDA. In this paper we give an overview of the energetic particle response in the vicinity of the moon and during the closest approaches to the moon Enceladus.

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