Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98..311f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A1, p. 311-321.
Physics
47
Atmospheric General Circulation Models, Atmospheric Heating, Particle Acceleration, Plasma Density, Thermosphere, Atmospheric Tides, Diurnal Variations, Wind Effects
Scientific paper
It is shown here that upward propagating tides produce significant acceleration and compositional effects on the zonal mean state of the thermosphere. This is demonstrated by forcing the NCAR thermosphere-ionosphere GCM with upward-propagating tidal components at a lower boundary height of 97 m and examining the differences in the zonal mean fields compared with results derived in the absence of lower boundary forcing. A westward jet of the order of 10-30 m/s in the equatorial lower thermosphere and weaker flanking eastward midlatitude jets are induced by eddy and molecular dissipation of the tidal motions. Salient characteristics of the jet are independent of tidal phase. Increases in the zonal mean N2 and O2 number densities of order 10-30 percent are produced by 110 km and between +/- 30 deg latitude, accompanied by electron density depletions of 10-15 percent above about 160 km due to the enhanced chemical loss.
Fesen Cassandra
Forbes Jeffrey M.
Roble Raymond G.
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