Abstract
We have analyzed geomagnetic storms (GMs) associated with coronal mass ejections speed ≥500Km/s, observed during the period of 2007-2014 with X-ray solar flares (SFs), magnetic clouds (MCs) and disturbances in solar wind plasma parameters, interplanetary magnetic fields (IMFB), southward component of interplanetary magnetic fields (IMFBz), solar wind plasma velocity (SWPV) and solar wind plasma temperature (SWPT). We have observed that majority of the geomagnetic storms (GMs) are associated with X-ray solar flares (SFs) of different categories, magnetic clouds and all the geomagnetic storms are associated with disturbances in solar wind plasma parameters. Positive correlation with correlation coefficient 0.59 has been found between magnitude of minimum Dst /-Dst/value of geomagnetic storms and peak value of associated disturbances in IMFB, 0.72 between magnitude of minimum Dst /-Dst/ value of geomagnetic storms (GMs) and magnitude of minimum nT /-nT/ value of associated disturbances in IMFBz. Further we have obtained positive correlation with correlation coefficient 0.53 between magnitude of minimum Dst /-Dst/value of geomagnetic storms (GMs) and peak value of associated disturbances in solar wind plasma temperature (SWPT) and 0.48 between magnitude of minimum Dst /-Dst/value of geomagnetic storms (GMs) and peak value of disturbances in solar wind plasma velocity (SWPV). We have concluded that halo coronal mass ejections (CMEs) associated geomagnetic storms are closely related with hard X-ray solar flares and disturbances in IMB, IMBz and SWPT.
KEYWORDS
Geomagnetic Storms (GMs), Coronal Mass Ejections (CMEs), Solar Flares (SFs), Magnetic Clouds (MCs) and Disturbances in Solar Wind Plasma Parameters.
Adarsh Prabhakar1*, P. L. Verma2
1Research Scholar, Department of Physics A.P. S. University, Rewa-486003, M. P., India
2Department of Physics, Govt. Vivekanand P.G. College Maihar-485771, M.P. India