Investigation of the Geoeffectiveness of CMEs Associated with IP Type II Radio Bursts

Abstract

We perform a statistical analysis of the geoeffectiveness of coronal mass ejections (CMEs) that are associated with interplanetary (IP) type II bursts in Solar Cycle 23 during the period 1997 - 2008. About 47 % (109 out of 232) of IP type II bursts are found to be associated with geomagnetic storms. Of these 47 %, 27 % are associated with moderate, 14 % with intense, and 6 % with severe geomagnetic storms. We find that the IP type II bursts and their corresponding end frequencies can be used as indicators of CME geoeffectiveness: the lower the type II burst end frequency, the higher the possibility of having a stronger storm. In addition, we show that various combinations of CME remote-sensing and IP type II parameters can be used to improve geomagnetic storm forecasting.