Abstract
Intense magnetic storms are dominantly caused by the interplanetary manifestations of fast coronal mass ejections (CMEs); and are in two forms: the sheath region and the CME ejecta itself; both involving an intense and long duration southward interplanetary magnetic field component Bz. A study of the storm events which were divided into two parts of ‘intense’ −250 nT ≤ peak Dst 10 nT and long duration (>3 hour) would always cause a depression in the Dst magnitude, signifying an intense storm. The study reveals that ‘very intense’ storms are more likely to experience shock in the interplanetary magnetic field region faster than ‘intense’ storms with a plasma flow speed >400 km/s. This is because Dst plots shows that activity of storm sudden commencement (SSC) is not noticeable until about 7 hours to storm day under ‘intense’ storms, whereas, it is as much as 12 hours to storm day for ‘very intense’ activities.
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