A coupled thermosphere/ionosphere general circulation model

Physics

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Atmospheric Circulation, Atmospheric Models, Magnetosphere-Ionosphere Coupling, Thermosphere, Aeronomy, Self Consistent Fields

Scientific paper

A thermospheric general circulation model is extended to include a self-consistent aeronomic scheme of the thermosphere and ionosphere. The model now calculates total temperature, global distributions of N(2D), N(4S) and NO, and a global ionosphere with distributions of O(+), NO(+), O2(+), N2(+), N(+), electron density, and ion temperature as well as the usual fields of winds, temperature and major composition. Mutual couplings between the thermospheric neutral gas and ionospheric plasma occur at each model time step and at each point of the geographic grid. Steady state results for this first Eulerian model of the ionosphere are presented for solar minimum equinox conditions. The calculated thermosphere and ionosphere global structure agrees reasonably well with the structure of these regions obtained from empirical models. This suggests that the major physical and chemical processes that describe the large-scale structure of the thermosphere and ionosphere have been identified and that a self-consistent aeronomic scheme, based on first principles, can be used to calculate thermospheric and ionospheric structure considering only external sources.

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