3D Multi-fluid/Multi-scale simulation of the Saturn-Titan Interaction: A new interpretation of Titan's wake structure during the Cassini T9 flyby

Details 3D Multi-fluid/Multi-scale simulation of the Saturn-Titan Interaction: A new interpretation of Titan's wake structure during the Cassini T9 flyby 3D Multi-fluid/Multi-scale simulation of the Saturn-Titan Interaction: A new interpretation of Titan's wake structure during the Cassini T9 flyby

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm41a..12s&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM41A-12

Physics

2753 Numerical Modeling, 5443 Magnetospheres (2756), 6275 Saturn, 6281 Titan

Scientific paper

Magnetometer and plasma measurements taken during the Cassini T9 flyby indicate that the wake region far (~5 Rt) from Titan is extremely dynamic. Two distinct, spatially separate plasma regions were detected with different electron densities and ion components. This result cannot be explained by single fluid modeling. We provide a new explanation of the T9 observations using a 3D Multi-fluid/Multi-scale simulation of Titan embedded within the Kronian magnetosphere. We find that the Kronian magnetosphere near 20 Rs is highly dynamic; in particular, the direction of plasma flow incident on Titan can differ from co-rotation by as much as 45 degrees. During periods when the flow direction is changing, we observe a wake structure that is very similar to the wake structure during the T9 flyby. Therefore, we propose that the two-tail structure observed during the T9 flyby is due to changes in the incident flow direction. This theory is supported by the observation that the center of Titan's ion tail during T9 was 36 degrees away from ideal co-rotation, indicating that the incident flow was not in the direction of co-rotation.

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