Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5493r&link_type=abstract
Journal of Geophysical Research, vol. 82, Dec. 1, 1977, p. 5493-5504.
Physics
13
Annual Variations, Atmospheric Circulation, Solar Cycles, Thermosphere, Atmospheric Models, Atmospheric Temperature, Equinoxes, Latitude, Solstices, Vertical Distribution
Scientific paper
A numerical model of the zonally-symmetric thermosphere is used to calculate seasonal and solar cycle variations of the zonal mean circulation, and the latitudinal temperature variations in the earth's thermosphere. A study of the heat and momentum sources which drive the thermospheric circulation shows that the circulation is primarily driven by heating caused by the absorption of solar electromagnetic activity modulated by a high-latitude heat source. A persistent solstice-type circulation, which manifests an abrupt transition near the equinox, is characteristic of thermospheric seasonal variation. During solar minimum the temperature difference from summer pole to winter pole is smaller, and the circulation is weaker, than during solar maximum.
Dickinson Robert E.
Ridley E. C.
Roble Raymond G.
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