Relationship of solar wind and geomagnetic storm

Abstract

The relationship between the solar wind magnetic field variations and the geomagnetic storms on the ground is investigated based on the data of the ISEE-3 and IMP-8 satellites in the interplanetary space and Dst-indices obtained from the ground magnetometers. This study shows a clear relationship between the geomagnetic storm index, Dst and a new devised index, which is made from a multiply of the southward IMF (Bz) and its duration (hours).