Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3327m&link_type=abstract
Journal of Geophysical Research, vol. 83, July 1, 1978, p. 3327-3336.
Physics
11
Atmospheric Circulation, Atmospheric Electricity, Auroral Zones, Coupled Modes, Electric Fields, Atmospheric Models, Ion Motion, Latitude, Ohmic Dissipation, Resistance Heating, Three Dimensional Models, Vertical Distribution, Wind Velocity
Scientific paper
A three-dimensional model has been developed to describe momentum coupling between high-latitude electric fields, neutral winds, temperature, and composition. The Hall drag is found to be the main source for atmospheric winds and the small divergence component of winds is due to the Pedersen drag and the Hall drag. Adiabatic heat transfer is responsible for the back pressure which damps the divergence field and for the reversal in circulation of the divergence field at higher altitudes. Back pressure causes a decrease in total wind velocity of about 10% at exospheric heights and by a factor of about 2 at 120 km. The wind field with the pressure feedback may be simulated by neglecting pressure variations and the Coriolis force. Density variations of Ar, N2, O, and He, induced by the momentum source, are in phase above 120 km and out of phase with the temperature amplitude above 150 km. The electrostatic field momentum source is ineffective for directly inducing density and temperature variations in the upper thermosphere.
Harris Isadore
Mayr Hans G.
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