Characteristics of Pickup Ions in Titan's Upper Atmosphere and Escape of Nitrogen

Details Characteristics of Pickup Ions in Titan's Upper Atmosphere and Escape of Nitrogen Characteristics of Pickup Ions in Titan's Upper Atmosphere and Escape of Nitrogen

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.0614m&link_type=abstract

American Astronomical Society, DPS meeting #36, #06.14; Bulletin of the American Astronomical Society, Vol. 36, p.1077

Astronomy and Astrophysics

Astronomy

Scientific paper

The distribution of 14 amu and 28-29 amu pickup ions with depth into Titan's atmosphere have calculated by Ledvina et al. (2004) and Brecht et al. (2000). Here we study the interaction of these ions with molecules in the upper atmosphere of Titan. As its environment is highly variable, Titan can be within Saturn's magnetosphere or can interact directly with the solar wind. These pickup ions follow the corresponding magnetic field as they penetrate into the atmosphere. The magnetic field strength considered here are 5.1 nT and 0.5 nT when Titan is inside the magnetosphere and in the solar wind respectively. The incident pick up ions collide with atmospheric neutrals. After they charge exchange, they are tracked under the influence of Titan's gravitational field. The energetic ions and neutral impart energy to the molecules in the Titan's atmosphere causing ejection, bond breaking and heating. Predictions will be made for the Cassini Titan flyby. The model described is flexible to incorporate that data as it becomes available.
References
Brecht, S.H., J.G. Luhmann, and D.J. Larson, Simulation of the Saturnian magnetospheric interaction with Titan, J. Geophys. Res., 105, 13119-13130, 2000.
Ledvina, S.A., S.H. Brecht, J.G. Luhmann, Ion distribution of 14 amu pickup ions associated with Titan's plasma interaction, Geophys. Res. Lett., 31, L17S10, 10.1029/2004GL019861, 2004.

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