Global simulations of dynamic magnetosphere response to steady southward IMF driving

We utilize the global MHD model BATS-R-US with incorporated nongyrotropic effects in diffusion regions to investigate the dynamic magnetosphere response to southward interplanetary magnetic field (IMF) driving. We analyze relative importance of the solar wind conditions, ionosphere conductance and dissipation mechanisms supporting the magnetotail reconnection in controlling the mode of magnetic energy release. The conditions for the quasi-periodic loading/unloading sawtooth response will be discussed.