Interaction Scenarios Between Rhea and Saturn's Magnetospheric Plasma: a Hybrid Simulation Approach

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2732 Magnetosphere Interactions With Satellites And Rings, 6280 Saturnian Satellites

Scientific paper

Rhea is the second largest moon of Saturn and a strong candidate for non-lunar type (absorbing body) interaction with Saturn's magnetospheric plasma. Pre-Cassini studies suggest that sputtering of the moon's surface could produce a weak but considerable oxygen exosphere and ionosphere, confined close to the surface. Another possibility is that dust may surround the moon, as seen at the Galilean satellites. These particles may be an additional, extended source of neutral and ionized species, complicating the nature of the interaction region. We examine the different Rhea-magnetospheric plasma interaction scenarios using a hybrid plasma simulation code (electrons treated as a massless, charge neutralizing fluid - ions as individual particles). We present the scales and the main interaction characteristics in each scenario and predict possible features that could be detected in future Rhea flybys by Cassini.

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