Super Strong Geomagnetic Storms and their Relation  with Energetic Solar Features and Disturbances in  Solar wind Plasma Parameters

P.L.Verma; Manoj Kumar Mishra; Monika Mishra; Preetum Singh; Arun Kumar

Volume : I, Issue : II, October - 2012

Super Strong Geomagnetic Storms and their Relation with Energetic Solar Features and Disturbances in Solar wind Plasma Parameters

P. L. Verma, Manoj Kumar Mishra, Monika Mishra, Preetum Singh, Arun Kumar

Abstract :

Coronal mass ejections are most energetic solar events that eject huge amount of mass and magnetic fields into the heliosphere and are widely recognized as being responsible to generate storms in solar wind plasma parameters and geomagnetic storms in the magnetosphere of the earth. We have studied geomagnetic storms≤–125nT observed during the period of 1997–2011 with coronal mass ejections, X ray solar flares and disturbances in solar wind plasma parameters. We have obtained scatter plots between magnitude of super strong geomagnetic storms with magnitude of peak values of southward component of Interplanetary Magnetic Field (IMFBz), total IMF B, peak values of solar wind velocity and pressure. We have found that 92.68% super strong geomagnetic storms are associated with halo and partial halo coronal mass ejections .Positive correlation has been found between magnitude of super strong geomagnetic storms and speed of associated coronal mass ejections . From the study of super strong geomagnetic storms and disturbances in interplanetary magnetic field, solar wind velocity and pressure. We have determined positive co–relation between magnitude of super strong geomagnetic storms and peak values of total IMF B and southward component of interplanetary magnetic field Bz with correlation coefficient 0.65, 0.71 respectively. Positive correlation has also been found between magnitude of super strong geomagnetic storms and peak values of solar wind plasma velocity and pressure with correlation coefficient .43, 38 respectively