Characteristics of Geomagnetic Storms and Their Drivers
Geomagnetic storms are the most disruptive space weather events in the geospace. The storms are typically classified by two types driven by (1) Coronal Mass Ejection (CME) or (2) Corotation Interaction Region (CIR) in the solar wind. Using superposed epoch analysis of SymH index for many storms, the characteristics of CME and CIR driven storms are obtained. Their associated solar wind data are also analyzed to show how different solar wind conditions create the storms.