Electron sources and transport in Saturn's magnetosphere an energetic view.

Details Electron sources and transport in Saturn's magnetosphere an energetic view. Electron sources and transport in Saturn's magnetosphere an energetic view.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm22b..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM22B-05

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2756 Planetary Magnetospheres (5443, 5737, 6033), 2760 Plasma Convection (2463), 7859 Transport Processes

Scientific paper

Saturn's inner magnetosphere contains electrons originating from Saturn's rings and moons, along with electrons transported from (and to) the outer magnetosphere. We can explore qualitatively how the plasma is moving and the location of plasma sources and sinks by performing phase space density (f(v)) analysis of in-situ data measured by the Cassini spacecraft. As plasma is transported, conservation of adiabatic invariants leads to predictable f(v) versus distance profiles and from which we can infer regions of plasma production and loss. Analysis of low energy (< 28 keV) electron pitch angle distributions has shown that the traditional single particle invariants of gyration and bounce are not always appropriate, presumably as the electrons are scattered and re-isotropized during transport. We therefore used a formulation of the isotropic invariant derived by Schulz [1998], and found that there exists an extended source of electrons between 6 and 12 Rs and heavy losses within 6 Rs. In this presentation we will summarize previous results from analysis of Cassini-ELS data and investigate the sources and transport of high energy electrons (30 3000 keV) in Saturn's inner magnetosphere (L < 15 Rs) by utilizing similar f(v) analyses of electron measurements made by the Cassini-LEMMS instrument.

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