On the structure and circulation of the polar thermosphere under magnetically quiet conditions

Details On the structure and circulation of the polar thermosphere under magnetically quiet conditions On the structure and circulation of the polar thermosphere under magnetically quiet conditions

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..983m&link_type=abstract

(IAGA, Symposium on Coupling, Energetics, Dynamics and Electrodynamics of Atmospheric Regions, Vancouver, Canada, Aug. 1987) Jou

Physics

4

Atmospheric Circulation, Atmospheric Composition, Polar Regions, Thermosphere, Diurnal Variations, Perturbation Theory, Resistance Heating, Spherical Harmonics, Temperature Distribution

Scientific paper

A theoretical study of the thermospheric circulation and composition at polar latitudes is presented. It is suggested that the observed motions and density perturbations in N2, O and He can be understood in terms of electric field momentum coupling, Joule heating, and interactions between these two processes. It is found that the vortex type double cell polar circulation is primarily driven by collisional momentum transfer from electric field induced ion convection. Because of the thermospheric low pass filter, a large time independent component is produced by Joule heating. Due to wind induced diffusion, the N2 is concentrated where the O and He are depleted and vice versa. The electric field driven vortex circulation redistributes the mass and energy in the time independent density and temperature variations, producing primarily diurnal variations in the temperature and composition near the pole and at auroral latitudes.

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