Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsa51b..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SA51B-04
Physics
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 2459 Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), 6275 Saturn
Scientific paper
A time-dependent one-dimensional photochemical model of Saturn's ionosphere has been developed as an intermediate step towards a fully coupled Saturn-Thermosphere-Ionosphere-Model (STIM). A global circulation model (GCM) of the thermosphere provides the latitude and local time dependent neutral atmosphere. In the ionosphere, photochemical calculations are shown to be valid for most latitudes below 2000 km, while above diffusive processes dominate. In this context, comparisons are made with the terrestrial F2 and E ionospheric layers. Voyager UVS occultation data are adapted to model the UV optical depth radial profile of the rings. Shadowing from the rings leads to attenuation of solar flux, the magnitude and latitudinal structure of which depends on season. During solstice, the season for Cassini's encounter with Saturn, attenuation has a maximum of two orders of magnitude, causing a reduction in modeled electron densities over mid-latitude locations by as much as a factor of five.
Mendillo Michael
Moore Lesa
Mueller-Wodarg Ingo
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