Statistics – Computation
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13a1886n&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13A-1886
Statistics
Computation
[2423] Ionosphere / Ionization Processes, [2455] Ionosphere / Particle Precipitation
Scientific paper
In-situ measurements by Cassini-Huygens have shown the importance of ionizing particles (solar photons, magnetospheric electrons and protons, cosmics rays) on the atmosphere of Titan. Ionizing particles play an important role in the atmospheric chemistry of Titan and must therefore be accurately modeled to understand the contribution of the differing sources of ionization. To model the initial galactic cosmic ray environment, the Badwar-O'Neill cosmic ray spectrum model was adapted for use at Titan. The Aeroplanets model, an electron transport model for the study of airglow and aurora, was then coupled to the Planetocosmics model, a Monte-carlo cosmic ray transport and energy deposition model, to compute ion production from cosmic rays. In addition, the NAIRAS model, a cosmic ray irradiation model adapted for fast computations, was adopted to the Titan environment and, for the first time, used to compute an ionization profile on a planet other than Earth and compared to the Planetocosmics results. For the first time, the importance of high charge cosmic rays on the ionization of the Titan atmosphere was demonstrated. High charge cosmic rays were found to be especially important below an altitude of 400 km, contributing significantly to the total ionization. Specifically, between 200 km and 400 km, alpha and higher charge cosmic rays are responsible for 40% of the ionization. The increase due to high charge cosmic rays was found for both the Planetocosmics and NAIRAS models.
Blattnig S.
Gronoff Guillaume
Mertens Chris J.
Norman Ryan B.
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