Thermospheric tides at equinox: Simulations with coupled composition and auroral forcings. I - Diurnal component. II - Semidiurnal component

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Atmospheric General Circulation Models, Atmospheric Tides, Auroras, Thermosphere, Wind Variations, Computerized Simulation, Equinoxes, Solar Cycles

Scientific paper

The effects of self-consistent composition couplings and high-latitude energy and momentum sources associated with auroral processes on the estimates by the NCAR thermospheric GCM of diurnal and semidiurnal thermospheric wind components and perturbation temperatures are examined by comparing estimates obtained with and without these effects. Results are presented for equinox conditions at solar cycle minimum and maximum. The simulations in which the coupling and the energy effects are taken into account were found to agree better with radar observations of the September 1984 equinox transition than did the earlier calculations performed without these effects.

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