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The magnetospheric response to step-like solar wind dynamic pressureincreases under southward IMF conditions is studied  using theUniversity of Michigan  MHD code. A two phased response in theionosphere is observed, similar to what is observed when the IMF isnorthward by  looking into the residual potential and field-alignedcurrent (FAC)  patterns in the ionosphere. The first phase responseright  after  the high pressure enhancement hits the magnetopause isassociated  with a pair of FACs downward in the postnoon and upward inthe  prenoon region. These FACs are caused by dusk-to-dawn electricfields inside the dayside magnetopause launched by a fast modecompressional wave. The second phase response shows another pair ofpotential cells as well as FACs in opposite polarity, which originatesfrom magnetospheric vortices on the equatorial plane. The vorticesappear to be formed by the recovery of the system  from the fast modewave

The response of the magnetosphere-ionosphere system to a sudden dynamic pressure enhancement under southward IMF conditions