Recent Observations of Titan's Suprathermal Corona

Details Recent Observations of Titan's Suprathermal Corona Recent Observations of Titan's Suprathermal Corona

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p21a1340w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P21A-1340

Other

0328 Exosphere, 6281 Titan

Scientific paper

Ion and Neutral Mass Spectrometer (INMS) measurements of nitrogen and methane densities as a function of radial distance during Cassini flybys are presented. These flybys cover a wide range of Titan latitudes, solar zenith angles and local times. Below the exobase the best fits are obtained using isothermal profiles. Most flybys exhibit breaks from isothermal profiles near the exobase. Large temperature increases would be required to fit the data above the exobase. Using an exospheric model based on the Liouville theorem, fits are produced for various exobase energy distributions. In general the best fits are found using energy distributions containing a suprathermal population. From the density of suprathermals at the exobase energy deposition rates are calculated. Implications for the escape of primary atmospheric constituents are also discussed.

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