Geomagnetic-disturbance diagnostics according to data from near-polar Antarctic stations - The MAGRS activity index
Investigations carried out in the framework of the MAGRS program in the south polar cap region are examined. A method for determining the MAGRS activity index (an IMF analog) according to data from the Vostok and Mirnyi stations is discussed. This index is then correlated with the disturbance level at the Molodezhnaia and Novolazarevskaia auroral stations. In 79 out of 106 situations examined, the evolution of a substorm at the auroral stations is shown to follow the southward turning of the vertical component of the MAGRS.
Geophysical Investigations at High Latitudes
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