Origin of Electron Plasma Populations Transport in Saturn's Magnetosphere

Details Origin of Electron Plasma Populations Transport in Saturn's Magnetosphere Origin of Electron Plasma Populations Transport in Saturn's Magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11b1268s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P11B-1268

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5421 Interactions With Particles And Fields, 6033 Magnetospheres (2756), 6275 Saturn, 7807 Charged Particle Motion And Acceleration

Scientific paper

Because the dynamics of Saturn's magnetosphere fall between the large scale and rotationally driven dynamics of Jupiter's magnetosphere and the solar wind driven dynamics of the Earth's magnetosphere, the origins of the main processes governing the radial transport of charged particles in the Kronian magnetosphere are difficult to identify. As for other magnetospheric systems, we have used the Dll = Do.Ln parametric form in our diffusion theory model for simulating the diffusive motion of trapped particles within Saturn's system. Our first computations of plasma distributions suggest that the low-energy electrons (cold plasma) need to be numerically transported outward to improve the comparisons with the CAPS-ELS data. Although Dll is a term of diffusion in the transport equation, the quantity of particles drifting away from the planet is not sufficient to be considered as important. The primary result of the radial diffusion term has been to transport the particles towards the planet. To match plasma observations inside 12 Rs better, we are re-examining the expression of the inward radial transport coefficient. The incorporation of outward transport into our diffusion theory model is also carried out. In this paper, we discuss the effects of Coriolis and Centrifugal forces on the transport of plasma. Both forces are expected to make trapped particles drift away from the planet by changing the characteristics of their pitch-angle and energy. Our simulation results will provide the opportunity to discuss the origin of outward plasma flows, as well as how they balance the inward transport. This work will further explain the distribution and circulation of electron plasma populations in Saturn's inner magnetosphere.

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