RPWS Cold Plasma Results from the Inner Magnetosphere of Saturn - dust-plasma interaction near the E-ring?

Details RPWS Cold Plasma Results from the Inner Magnetosphere of Saturn - dust-plasma interaction near the E-ring? RPWS Cold Plasma Results from the Inner Magnetosphere of Saturn - dust-plasma interaction near the E-ring?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p41a1257w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P41A-1257

Other

5719 Interactions With Particles And Fields, 5759 Rings And Dust, 6275 Saturn, 7849 Plasma Interactions With Dust And Aerosols (2461)

Scientific paper

We present new results indicating that the negatively charged E-ring ice-dust inside 6 RS couples electro- dynamically to the dense cold plasma in the inner magnetosphere of Saturn. The measurements by the Radio and Plasma Wave Science (RPWS) on board the Cassini spacecraft, in particular by the Langmuir probe, determine continuously the cold plasma characteristics of the inner magnetosphere. Typical values reveal a cold plasma component (Te~0.5-5 eV, Ti < few eV) near the ring plane with densities near 100 cm-3 and dominated by water group ions. The moon Enceladus and the E-ring are probable sources for this plasma (after ionization of the water rich gas). Langmuir probe voltage sweeps indicate that the cold plasma rotates around Saturn with a speed significantly less than co-rotation. New interferometer results based on density inhomogeneities in the plasma suggest that there are two ion components associated with this flow. One has a low temperature (Ti < 5 eV) and is trapped around the few volts negatively charged ice grains and therefore moves with a near Keplerian speed around Saturn. The other is a hotter ion population (Ti > 5 eV) that has been picked-up by co-rotational induced electric field and therefore co-rotates with Saturn. Parameter estimates suggests that a large part of the E-ring interacts with the plasma disk as true dusty plasma.

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