Simulations of Ionospheric Storms using a Coupled Magnetosphere-Ionosphere-Thermosphere Model

Physics

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2407 Auroral Ionosphere (2704), 2437 Ionospheric Dynamics, 2704 Auroral Phenomena (2407)

Scientific paper

The Coupled Magnetosphere Ionosphere Thermosphere (CMIT) model combines the Lyon-Fedder-Mobarry (LFM) global magnetospheric simulation model with the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model. It simulates the interaction of the magnetosphere and ionosphere in the auroral regions by imposing energetic particle fluxes derived from the magnetospheric current system on the thermosphere-ionosphere model, and using the ionospheric conductance calculated by the three-dimensional interactive thermosphere-ionosphere model as the inner boundary condition of the magnetospheric MHD calculation. New advances in the CMIT model include the imposition of neutral wind forcing on the magnetosphere-ionosphere current system, and the inclusion of global ionospheric electrodynamics. We describe simulations of ionospheric changes during geomagnetic disturbances performed using the CMIT model, driven both by measured solar wind parameters upstream of the magnetosphere and by heliospheric models, and discuss new directions in coupled geospace model development.

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