Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..892b&link_type=abstract
Planetary and Space Science, vol. 23, May 1975, p. 892-896.
Physics
1
Angular Momentum, Earth Rotation, Meteoroids, Thermosphere, Atmospheric Circulation, Equations Of Motion, Geomagnetism, Momentum Transfer, Viscous Drag
Scientific paper
Mitra has suggested that the superrotation of the upper atmosphere is caused by a deposition of meteoroids. The meteoroids are assumed to impart to the atmosphere the excess of their orbital angular momentum per unit mass over the earth's angular momentum per unit mass. The process is to take place in the height region above 150 km. Only above this height is a superrotation of the atmosphere observed. In this report the forces that tend to make the atmosphere corotate with the earth are analysed. It is shown that the most important of these forces is ion drag, and not viscous drag as postulated by Mitra. As the net angular spin momentum imparted by the meteoroids seems to be less than Mitra's estimate and its main part is applied to the atmosphere at altitudes much lower than 150 km, the hypothesis that meteoroids provide a significant contribution to the superrotation is rejected.
Blum Peter W.
Hughes David W. W.
Schuchardt G. H. K.
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