Collaborative Research: GEM--Magnetic Storm Modeling

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Three magnetic storms were identified by the joint SHINE-GEM-CEDAR magnetic storm campaign as candidates for a broad and inclusive study of the dynamics of magnetic storms. The periods to be studies are 10-11 May 1997, 24 Sept. - 1 Oct. 1998, and 18-31 Oct. 1998. This study will examine the spatial and temporal evolution of the electric fields in the inner magnetosphere during the three storm study periods. A global model for the storm-time electric field will be obtained by mapping the ionospheric electric field (as determined from ground based observations using the Assimilative Mapping of Ionospheric Electrodynamic - AMIE - technique) into the magnetosphere along magnetic field lines. The effects of penetration of electric fields to lower latitudes and hence the inner magnetosphere will be incorporated by a detailed analysis of field-aligned currents associated with the divergence of the ring current computed by the Ring Current-Atmosphere interaction Model (RAM). The RAM model will also be further extended to include the effect of wave-particle scattering of energetic O+ ions. The model results will be compared with satellite data.