3D Multi-fluid Simulations of Titan’s Plasma Interaction

Details 3D Multi-fluid Simulations of Titan’s Plasma Interaction 3D Multi-fluid Simulations of Titan’s Plasma Interaction

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2522s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #25.22; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a 3D multi-fluid simulation we show that finite ion gyroradius effects are extremely important in characterizing the plasma interaction at Titan. The multi-fluid method is ideal for studying Titan’s plasma interaction with Saturn’s magnetosphere because it incorporates ion cyclotron and multi-ion species effects similar to hybrid codes but the fluid treatment enables grid refinement down to as small as 26 km. 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 tail of the induced magnetosphere. 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.

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