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Original Research

IJCRR. 2012; 4(19): 07-14


CMEs RELATED MODERATELY INTENSE GEOMAGNETIC STORMS AND THEIR RELATION WITH SOLAR FEATURES AND SOLAR WIND PLASMA PARAMETERS

S.R.Lahauriya, P.L.Verma, A.P.Mishra.

Abstract
We have studied CMEs related moderately intense geomagnetic storms-80nT ≥ Dst ≥-200nT, observed during the period of 1997to2007 with solar features and solar wind plasma parameters. We have found that all the CMEs related moderately intense geomagnetic storms are associated with X- ray solar flares of different categories. The association rates of X class, M class, C class and B class X ray solar flares are 15.51%,31.03%,41.37% and 12.5% respectively. It is also found that majority of the CMEs related moderately geomagnetic storms are associated with radio bursts (81.03%).The association rates of type II and type IV radio bursts have been found 48.93% and 51.06% respectively. Further we have concluded that CMEs related moderately intense geomagnetic storms are closely related to disturbances in solar wind plasma parameters. Positive co-relation has been found between magnitude of CMEs related moderately intense geomagnetic storms and maximum (peak) value of average interplanetary magnetic field of associated JIMF events. Statistically calculated co-relation co-efficient is 0.40 between these two events. Positive co-relation has been found between magnitude of CMEs related moderately intense geomagnetic storms and magnitude of maximum (peak) value of southward component of interplanetary magnetic field of associated JIMFBz events. Statistically calculated co-relation co-efficient is 0.44 between these two events. Positive co-relation has also been found between magnitude of CMEs related moderately intense geomagnetic storms and maximum (peak) value of solar wind plasma velocity. Statistically calculated co-relation co-efficient is 0.28 between these two events.

Key words: Moderately intense geomagnetic storms, Coronal mass ejections, Solar flares, Solar wind plasma parameters.



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