Magnetospheric convection and upper atmospheric dynamics

Physics

Scientific paper

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Atmospheric Physics, Convection, Earth Magnetosphere, Electric Fields, Plasma Interactions, Upper Atmosphere, Atmospheric Models, Far Ultraviolet Radiation, Ion Motion, Ohmic Dissipation, Resistance Heating, Thermosphere, Three Dimensional Models

Scientific paper

The numerical calculations described were carried out to study explicitly the dynamical effects of magnetospheric convection on the neutral upper atmosphere at heights between 120 and 500 km. Calculations are based on a global three-dimensional numerical model described by Cheekmore et al. (1975) (which takes into account the effects of viscosity, ion drag, the Coriolis force, and heating due to absorption of solar EUV radiation), modified to include both momentum and energy sources generated by interaction of the neutral atmosphere with ionospheric plasma participating in magnetospheric convection. A fully self-consistent treatment of steady state thermospheric dynamics is carried out. The resulting wind, density, and temperature fields are representative of the global characteristics of the steady state thermosphere under sufficiently quiet geomagnetic conditions. All calculations are carried out for equinox conditions.

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