3D Multi-fluid Model of the Coupled Ion and Neutral Interaction between Titan’s Ionosphere and Saturn’s Magnetosphere

Details 3D Multi-fluid Model of the Coupled Ion and Neutral Interaction between Titan’s Ionosphere and Saturn’s Magnetosphere 3D Multi-fluid Model of the Coupled Ion and Neutral Interaction between Titan’s Ionosphere and Saturn’s Magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p13d..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P13D-07

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

The interaction between plasma in Saturn’s magnetosphere and Titan’s ionosphere is complex because of the high density of neutral particles in Titan’s ionosphere, the variability of Saturn’s magnetosphere, and the variation of solar zenith angle as Titan orbits around Saturn’s magnetosphere. Modeling this interaction can be difficult because 1-D and 2-D atmospheric models that include detailed chemistry cannot capture the three-dimensionality of photoionization, field line draping, and magnetospheric particle precipitation in Titan’s ionosphere. Three-dimensional plasma models have difficulty including the detailed chemistry that affects ion density, transport, and loss. We have developed a 3D multi-fluid model of the plasma interaction near Titan that includes three ion and two neutral species. The neutral particles in the atmosphere of Titan are ionized through photoionization, impact from magnetospheric electrons, and charge exchanging interactions with ions in the ionosphere. Ions are lost through dissociative recombination, charge exchange, and ion pick-up. The outflow rate of ions from Titan’s ionosphere will be determined for three different environments in Saturn’s magnetosphere: lobe-like, current sheet, and magnetosheath. Results from the model will be compared with MAG and CAPS data from Cassini fly-bys in each of those environments. Ion loss rates will also be compared for the three cases and for three different solar zenith angles.

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