Rotation of the Variation of Upper Atmosphere

Details Rotation of the Variation of Upper Atmosphere Rotation of the Variation of Upper Atmosphere

Jan 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971natur.229..333r&link_type=abstract

Nature, Volume 229, Issue 5283, pp. 333-334 (1971).

Physics

5

Scientific paper

FROM observations of satellite orbits it has been deduced that the atmosphere above about 200 km altitude rotates 20-30% faster than the Earth, so that there exists a net west-to-east wind of order 100 m s-1 (refs. 1, 2). This ``super-rotation'' has not yet been satisfactorily explained. The wind systems driven by the diurnal heating and cooling of the thermosphere3 do not produce any significant net rotation at mid-latitudes4. The satellite data are somewhat weighted towards low latitudes so the rotation may be most pronounced there; calculations suggest that the thermospheric winds may produce some net rotation at low latitudes5, though probably not enough to account fully for the observations. Ionospheric motions driven by dynamo electric fields in the E region do not seem to make any significant difference to this result5.

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