Two-fluid Mhd Study On Ion Loss From Titan'S Atmosphere

Astronomy and Astrophysics – Astronomy

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Scientific paper

This presentation report progress on modeling of Titan's plasma interaction. The single fluid model is improved by including an electron energy equation in the Hall MHD model so that both electron temperature and ion temperature are self-consistently calculated. The plasma interaction with Titan is expected to vary as the moon moves around its orbit. Using the improved model, we compare the structure of the interaction under two extreme conditions, corresponding to upstream flow interacting with the nightside and dayside ionosphere respectively. Model results show that the dayside ionosphere is more extended and the flow is more disturbed in the 6 SLT case than in the 18 SLT case. We also calculate the ion escape rates under these conditions and compare with Cassini observations of the available low altitudes Cassini flybys in corresponding SLTs.

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