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The energy transfer during the interaction of large-scale solar windstructure and the Earth's magnetosphere is the chronic issue in space-weatherstudies. To understand this, researchers widely studied the geomagnetic stormsand sub-storms phenomena. The present understanding suggests that long durationof southward interplanetary magnetic field component is the most importantparameter for the geomagnetic storm. Such long duration strong southwardmagnetic field is often associated with ICMEs, torsional Alfven fluctuationssuperposed co-rotating interacting regions (CIRs) and fast solar wind streams.Torsional Alfven fluctuations embedded CIRs have been known for a long, howevermagnetic cloud embedded with such fluctuations are rarely observed. Thepresence of Alfven waves in the ICME/MC and influence of these waves on thestorm evolution remains an interesting topic of study. The present workconfirms the torsional Alfven waves in a magnetic cloud associated with a CMElaunched on 15th February which impacted the Earth's magnetosphere on February18, 2011. Further, observations indicate that these waves inject energy intothe magnetosphere during the storm and contribute to the long recovery time ofgeomagnetic storms. Our study suggests that presence of torsional Alfven wavessignificantly controls the storm dynamics.

Torsional Alfven wave embedded ICME magnetic cloud and corresponding geomagnetic storm