Inner magnetosphere--global MHD coupled code: initial results

We present results of a one-way coupling between a global MHD model (BATSRUS) and a ring current model with ionosphere feedback (CRCM). The MHD model provides magnetic field in all computational regions and electric field potential, temperature and density at the outer boundary. The ring current model calculates the plasma distribution (H+ and e-) in the energy range 1-200keV, field-aligned currents of Region-2 and electric fields. We consider inner magnetosphere dynamics during an idealized case with south-north-south Bz turning as well as a real event during the 12 August 2000 storm. For the idealized case, we reproduce basic features of the electric field in the inner magnetosphere: strong convection during southward IMF and shielding, weak convection during northward IMF and overshielding. Additionally, we estimate characteristic times for shielding/overshielding formation. For the 12 August 2000 event we calculate ring current 3D fluxes and reconstruct energetic neutral atom (ENA) images. We compare the modeled ENA images with those observed by IMAGE HENA imager and investigate global ring current dynamics during 12 August 2000 event.