Upper Atmosphere Dynamics

Details Upper Atmosphere Dynamics Upper Atmosphere Dynamics

May 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970saosr.316.....f&link_type=abstract

SAO Special Report #316 (1970)

Physics

Scientific paper

We are able to construct three-dimensional global models of the upper atmosphere (120 to 800 km) by solving the conservation equations of mass, momentum, and energy. We show that variation of conditions at the lower boundary, 120 km, affects the atmosphere only to about 200-km altitude. Differing results obtained by in situ satellite or rocket measurements in the 120- to 200-km range can therefore be explained as resulting from atmospheric behaviour below 120 km. We report on a study of possible wind fields and find diurnally varying winds with no steady east-to-west flow. Viscous forces at the higher altitudes match the pressure gradient forces and give rise to small wind magnitudes above 300 km. Maximum wind speeds are found to occur near 140 km. where viscous effects are not too great.

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