Physics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jatp...36.1707j&link_type=abstract
(International Association of Geomagnetism and Aeronomy, Symposium on Dynamics, Chemistry and Thermal Processes in the Ionospher
Physics
Atmospheric Composition, Atmospheric Heating, Oxygen Atoms, Solar Heating, Thermosphere, Wind Effects, Atmospheric Circulation, Atmospheric Heat Budget, Energy Transfer, Magnetic Disturbances, Ogo-6, Oxygen Recombination, Polar Regions, Solstices, Winter
Scientific paper
The asymmetry in solar heat input to the upper atmosphere at the solstice, and the asymmetry in atomic oxygen production, are largely compensated by a large scale wind system towards the winter polar region. At magnetically disturbed times, atmospheric composition at high winter latitudes changes in such a way as to indicate that polar region heating by magnetic variations, energetic particle inputs, and current systems is more intense than solar heating at low latitudes, thus leading to a reversal of the normal pattern of upper atmospheric circulation. Uncertainties in the intensity of solar radiation responsible for upper atmospheric heating and oxygen dissociation, and uncertainties in the degree of oxygen dissociation in the upper atmosphere, are such that the average rates of eddy mixing may be significantly lower than frequently assumed for the lower thermosphere.
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