Physics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2829o&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 18, p. 2829-2832
Physics
5
Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Ionosphere: Ionosphere/Atmosphere Interactions
Scientific paper
Using measurements of electron temperature and density, a model of neutral density, and a theoretical expression for the O+-O collision cross section, we compute the ion temperature and find it to be lower than the measured value. We compute the amount of hot O at 4000°K necessary to provide this heat deficit. At 400 km altitude very little hot O is needed at solar maximum while 1-2% of total O must be hot at solar maximum. Hot O densities at 400 km altitude are lowest during the day, highest at night; lowest at the equinoxes, highest at the solstices; lowest at solar maximum, highest at solar minimum; lowest for magnetically disturbed periods, highest for quiet periods; lowest for a warm, dense thermosphere, highest for a cool, rare thermosphere. All of these variations are consistent with thermal quenching by ambient O, with larger ambient O densities yielding lower hot O densities. This indicates that hot O should form a layer shape in the atmosphere.
Oliver William L.
Schoendorf Jacqueline
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