Thermospheric dynamics - Understanding the unusual disturbances by means of simulations with a full-coupled global thermosphere/high-latitude ionosphere model

Physics

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Atmospheric Circulation, Atmospheric Models, Ionospheric Disturbances, Magnetic Storms, Thermosphere, Annual Variations, Auroral Zones, E Region, F Region, Satellite Imagery, Universal Time

Scientific paper

A fully self-consistent numerical model of the polar ionosphere and the global thermosphere is used to examine the effects of self-consistent enhancement of E- and F-region ionization and conductivity within the auroral ovals and polar regions, and the consequent response of the neutral circulation to geomagnetic forcing. The plasma densities of the auroral E-region are shown to be significantly enhanced even under quiet geomagnetic conditions. Rather unusual and large thermospheric wind and structural disturbance patterns are observed during highly disturbed geomagnetic conditions.

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