3D Multi-fluid simulations of Titan's plasma interaction highlighting the importance of ion gyroradius effects

Details 3D Multi-fluid simulations of Titan's plasma interaction highlighting the importance of ion gyroradius effects 3D Multi-fluid simulations of Titan's plasma interaction highlighting the importance of ion gyroradius effects

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p13a0158s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P13A-0158

Physics

2732 Magnetosphere Interactions With Satellites And Rings, 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 5421 Interactions With Particles And Fields, 6281 Titan

Scientific paper

Using a 3D multi-fluid model with high resolution (~26 km) we show that finite ion gyroradius effects are extremely important in characterizing the plasma interaction at Titan. Ion gyroradius effects are shown to cause an increase in energetic ions incident upon Titan's ionosphere in two regions: on the Saturn facing side of Titan's magnetosphere, where Saturnian ions interact with an extended mass loaded region, and on the wake side of Titan's ionosphere, where the trajectories of pick-up ions cause them to flow back towards the ionosphere with high velocities. Ion gyroradius effects also are important in describing the outflow of ions into Saturn's magnetosphere. In our simulation, pick-up ions from the Saturn facing side of the ionosphere form ion beams that flow away from the ion tail. These ion effects can be seen in sample spectrographs generated from our simulation, which we compare to Cassini plasma spectrometer results. To ground-truth our model, sample magnetometer data from a single simulation is compared to Cassini magnetometer data from the TA, TB and T3 flybys. The positive Bx component of the incident field is shown to be responsible for the more strongly magnetized northern lobe observed in each flyby.

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