SM31D-4242:
Magnetospheric and Ground Response to a Strong Interplanetary Shock
Wednesday, 17 December 2014
Galina Ivanovna Korotova, University of Maryland College Park, College Park, MD, United States and David G Sibeck, NASA/GSFC, Greenbelt, MD, United States
Abstract:
We present results from a study of interplanetary shock observations by eleven spacecraft and more than fifty ground stations in both hemispheres near 1650 UT on January 19, 2013. The solar wind density observed by Wind increased from 6 to 20 cm-3, and the dynamic pressure increased from 1 to 6 nPa. The IMF had a spiral orientation. We timed the propagation of the shock through interplanetary space and into the inner magnetosphere. It took about 1 min for the shock to propagate from the dayside to the nightside magnetosphere where the compressions were accompanied by three cycles of toroidal Pc5 oscillations in the azimuthal component of the magnetic field observed by Van Allen Probes A and B. The ground response to the shock was very pronounced, global, and depended on the location of the observing station. Some stations observed location-dependent periodic oscillations.
