Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13a1885r&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13A-1885
Physics
[6281] Planetary Sciences: Solar System Objects / Titan
Scientific paper
Solar photons and precipitating energetic electrons from the magnetosphere of Saturn ionize the neutral atmosphere of Titan creating an ionosphere. The Ion Neutral Mass Spectrometer (INMS) aboard the Cassini spacecraft provides in situ data regarding the composition of the ionosphere and neutral atmosphere. The Cassini Plasma Spectrometer - Electron Spectrometer (CAPS-ELS) supplies information about the magnetospheric electron environment of Titan. Using data from these instruments, ion production rate profiles versus altitude are constructed for the primary ionization products of N2 and CH4 in a globally averaged neutral atmosphere for the four canonical magnetospheric environments (plasma sheet, magnetosheath, bi-modal, and lobe-like) of Titan presented in Rymer et al. [2009] and at various solar zenith angles for various orientations of possible magnetic field lines. An empirical approach utilizing INMS ion density measurements and a photochemical model are used to verify the results and to present empirical ion production rates. The relative importance of magnetospheric and solar sources on the ion production rates in Titan's ionosphere are discussed.
Cravens Thomas E.
Mandt Kathleen
Richard Steven M.
Robertson Ina P.
Rymer Abigail M.
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