Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa21a..12s&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA21A-12
Physics
0358 Thermosphere: Energy Deposition
Scientific paper
Any planetary atmosphere has an upper layer where molecular heat conduction contributes significantly to the energy balance. In that layer the heat from absorbed solar radiation is transferred down to the lower atmosphere where it is removed away by the longwave radiation of atmosphere. We call that layer an upper thermal boundary layer and propose a general model for it in terms of dimensionless variables and parameters. The values of the dimensionless parameters and relations between them were obtained for Earth and Mars by fitting the calculated temperature profile to the empirical one. A distinction in kind in the interrelations of the mechanisms that determine the thermal structure of the layer is revealed for these planets, which reflects the difference in the mixing ratios of carbon dioxide in the atmospheres of Earth and Mars to orders of magnitude. The model consistency and accuracy is examined by an attempt to retrieve approximately the mixing ratio of atomic oxygen in the thermosphere of Mars from the empirical temperature profile. The accelerometer data obtained by MGS spacecraft during aerobraking are used to derive an average temperature profile of dayside thermosphere of Mars in Northern hemisphere during spring and intermediate (from minimum to moderate) solar activity conditions.
Semenov Alexander
Shved G.
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