Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..682h&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Physics
Scientific paper
We present here model results from our 3d Monte Carlo model which simulates the scattering of solar radiation by hydrogen atoms at LyA wavelengths in Titan's exosphere. We apply our model to data from the Hydrogen Deuterium Absorption Cell (HDAC) onboard Cassini during the flyby T9 in Dec 2005, which measures the LyA radiation from Titan's exosphere. We use our model in order to simulate the HDAC measurements and obtain best fitting hydrogen profiles in the altitude range between the exobase, located at 1,500km, and 30,000km. In our model, hydrogen atoms act as a scattering medium, whereas methane acts as an absorber. The methane profile between 900 and 2000km is taken from INMS data and extrapolated using a 1D exospheric Monte Carlo model. We applied different hydrogen distributions to our model and furthermore performed a sensitivity study on the hydrogen density at the exobase within the values found in the literature, which vary within one order of magnitude, as well as on the exospheric temperature.
Esposito Larry
Hedelt Pascal
Ito Yukari
Keller Ursula
Korth Alex
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