Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..149s&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
Beginning with the Pioneer 11 and Voyager 1 and 2 encounters with Saturn, scientists have striven to understand the physical mechanisms governing plasma dynamics within the Kronian system. In the early 2000s, icy satellites, dust rings, and neutral clouds were suspected to be plausible sources of plasma populations inside about 15 Rs. Yet, none of those objects appeared to play a dominant role in the production of low-energy particles, nor did they explain the Kronian plasma populations' morphology, dynamics and circulation. While significant gains in understanding have been made with the wealth of data collected since the beginning of Cassini's tour, many other questions have been raised from these new observations regarding the composition, sources, sinks, and transport of plasma populations. To further our understanding of the processes governing plasma dynamics observed in Saturn's magnetosphere, a comprehensive physical model has been recently developed. Our primary objective in developing a plasma transport model is to investigate the dominant sources of plasma electrons in Saturn's inner magnetosphere. We will also analyze the physical processes important in the redistribution and transport of the low-energy electrons and examine the plasma dynamic response to magnetospheric perturbations. In this paper, we present our results obtained by combining various Cassini data sets with a model of diffusion theory. We focus our discussion on model results that describe how low-energy electron populations are produced and evolve due to their interactions with neutrals. Next, we present our ongoing investigation of local sources close to icy moons, and the modeling of outward plasma transport associated with the Coriolis and Centrifugal drifts. We conclude by mentioning the possible response of plasma transport to the ring current dynamics.
Andre Nicolas
Bolton James S.
Johnson Robert E.
Menietti Douglas J.
Paty Carol S.
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