Abstract
We have analyzed geomagnetic storms (GMs) associated with partial halo coronal mass ejections , observed during the period of ascending phase of solar cycle 25 with solar and solar wind parameters X-ray solar flares (SFs) and disturbances in solar wind plasma parameters, interplanetary magnetic fields (IMFB), southward component of interplanetary magnetic fields (IMFBz), solar wind plasma velocity (SWPV) ,solar wind plasma temperature (SWPT) and solar wind plasma pressure (SWPP) .We have observed that all the P-CMEs related geomagnetic storms are associated with X-ray solar flares (SFs) of different categories. Positive correlation with correlation coefficient 0.27 has been found between magnitude of P-CMEs related geomagnetic storms and speed of associated partial halo CMEs. Further all the P-CMEs related geomagnetic storms (GMs) are associated with disturbances in solar wind plasma parameters. Large positive correlation with correlation coefficient 0.73 has been found between magnitude of P-CMEs related geomagnetic storms (GMs) and peak value of associated disturbances in IMFB, 0.85 between magnitude of P-CMEs related geomagnetic storms (GMs) and peak value of associated disturbances in IMFBz. Further we have obtained positive correlation with correlation coefficient 0.50 between magnitude of P-CMEs related geomagnetic storms (GMs) and peak value of disturbances in SWPT,0.40 between magnitude of P-CMEs related geomagnetic storms (GMs) and peak value of disturbances in SWPV and 0.76 between magnitude of P-CMEs related geomagnetic storms (GMs) and peak value of disturbances in SWPP. We have concluded that partial halo coronal mass ejections (CMEs) associated with hard X-ray solar flares and disturbances in solar wind plasma parameters are responsible to generate geomagnetic storms (GMs).
KEYWORDS
Geomagnetic Storms (GMs), Disturbances in Solar Wind Plasma Parameters, Partial Halo Coronal Mass Ejections (CMEs), Solar Flares (SFs).
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