Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm33a1251s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM33A-1251
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling
Scientific paper
The Jovian magnetosphere is fed by plasma from Io, the icy Galilean moons and the Jovian ionosphere. The plasmas from these different sources not only differ in mass composition and outflow rate, but also have access to different regions. The mixing of these plasmas plays a critical role in determining the overall size and structure of the Jovian magnetosphere. 3-D multi-fluid simulations that incorporate the heavy and light ion interactions are used to model the mixing of heavy ion torus plasma with light ion outflow from the Jovian magnetosphere. It is shown that at radii smaller than the Io torus the plasma is completely co-rotational and that the main loss mechanism is to the Jovian ionosphere. Light ions continue to have essentially no departure from being fully co-rotational out to about 13 RJ, while the heavy torus ions show some slippage with lifetimes of the order of about 60 hrs. Between 13 RJ and about 20 RJ lifetimes of both light and heavy ions is of the order of about 100 hrs. These characteristics are most strongly dependent of the torus plasma density rather than the ionospheric outflow rate. Beyond this distance, deviations from co-rotation becoming an increasing larger effect and lifetimes decrease. The properties of the ionospheric outflows play an increasingly important role in this region. The co-rotation boundary and position of the magnetosphere are shown to move significantly under the convection of torus and ionospheric plasma from the inner magnetosphere into the outer magnetosphere.
Harnett Erika
Paty Carol
Stickle A.
Winglee Robert M.
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