Coronal Mass Ejections And Disturbances In Solar Wind Plasma Parameters In Relation With Geomagnetic Storms

15th International Congress on Plasma Physics; 13th Latin American Workshop on Plasma Physics

Verma, P.L.^1 ; Singh, Puspraj^2 ; Singh, Preetam^3

Department of Physics, Govt.Vivekanand P.G. College, Maihar, Satna, M.P., India^1

A.P.S.University, Rewa, M.P., India^2

Govt. P.G. College, Satna, M.P., India^3

关键词: Association rates;    Coronal mass ejection;    Geomagnetic fields;    Geomagnetic storm;    Interplanetary magnetic fields;    Large disturbance;    Solar wind density;    Solar wind plasmas;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012060/pdf
DOI  :  10.1088/1742-6596/511/1/012060

来源: IOP

【 摘 要 】

Coronal Mass Ejections (CMEs) are the drastic solar events in which huge amount of solar plasma materials are ejected into the heliosphere from the sun and are mainly responsible to generate large disturbances in solar wind plasma parameters and geomagnetic storms in geomagnetic field. We have studied geomagnetic storms, (Dst ≤-75nT) observed during the period of 1997-2007 with Coronal Mass Ejections and disturbances in solar wind plasma parameters (solar wind temperature, velocity, density and interplanetary magnetic field) .We have inferred that most of the geomagnetic storms are associated with halo and partial halo Coronal Mass Ejections (CMEs).The association rate of halo and partial halo coronal mass ejections are found 72.37 % and 27.63 % respectively. Further we have concluded that geomagnetic storms are closely associated with the disturbances in solar wind plasma parameters. We have determined positive co-relation between magnitudes of geomagnetic storms and magnitude of jump in solar wind plasma temperature, jump in solar wind plasma density, jump in solar wind plasma velocity and jump in average interplanetary magnetic field with co-relation co-efficient 0 .35 between magnitude of geomagnetic storms and magnitude of jump in solar wind plasma temperature, 0.19 between magnitude of geomagnetic storms and magnitude of jump in solar wind density, 0.34 between magnitude of geomagnetic storms and magnitude of jump in solar wind plasma velocity, 0.66 between magnitude of geomagnetic storms and magnitude of jump in average interplanetary magnetic field respectively. We have concluded that geomagnetic storms are mainly caused by Coronal Mass Ejections and disturbances in solar wind plasma parameters that they generate.