Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21b2019o&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM21B-2019
Physics
[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [5737] Planetary Sciences: Fluid Planets / Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites
Scientific paper
The environment around Enceladus is influenced by plasma interactions with the neutral gas and dust ejected from its southern plume(s). The interaction with the neutrals is through charge exchange and the related ion chemistry while the interaction with the dust occurs once they become electrically charged. The extent to which each of these interactions contributes to the overall structure and dynamics of the interaction region remains a topic of investigation. In this presentation we discuss results from 3-D electromagnetic hybrid (kinetic ions, fluid electrons) simulations to show the role of charged dust and neutral gas in the deceleration of the co-rotating plasma. Using the dust impact rates obtained by the RPWS during E3 and E7 Enceladus encounters, we have constructed models for the spatial distribution of dust particles of all size during each pass and used them in the hybrid simulations. Comparison of the simulation results to CAPS observations seen in a companion presentation (Tokar et al.) shows that electron absorption by dust can reduce the co-rotation speed by a few km/s, however, the observed stagnation of the plasma occurs primarily through charge exchange with the neutrals.
Averkamp Terry
Gurnett Donald A.
Kurth Willaim S.
Omidi Nojan
Tokar Robert L.
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