Coronal Mass Ejections and Disturbances in Solar Wind Plasma Parameters in Relation With Short Term Asymmetric Cosmic Ray Intensity Decreases

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

Verma, P.L.^1 ; Soni, Shiva^2 ; Pimpalker, Anil Kumar^3

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

Research Scholar Govt. P.G. College, Satna, M.P., India^2

Research Scholar A.P.S.University, Rewa, M.P., India^3

关键词: Association rates;    Coronal mass ejection;    Cosmic ray intensity;    Interplanetary shocks;    Maximum velocity;    Neutron monitors;    Solar wind plasmas;    Wind temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012056/pdf
DOI  :  10.1088/1742-6596/511/1/012056

来源: IOP

【 摘 要 】

Coronal mass ejections(CMEs} are a key aspect of coronal and interplanetary dynamics. They can eject large amounts of mass and magnetic field into the heliosphere, a key source of interplanetary shocks, disturbances in solar wind plasma parameters and asymmetric cosmic ray intensity decreases (Fds). We have studied asymmetric cosmic ray intensity decreases (Fds) (≥magnitudes 3.0%) observed at Oulu super neutron monitor, during the period of 1986-2006 with coronal mass ejections, interplanetary shocks and disturbances in solar wind plasma parameters (solar wind temperature, velocity, density). We have found that 88.46% are associated with halo and partial halo coronal mass ejections (CMEs). The association rate between halo and partial halo coronal mass ejections are found 89.13% and 10.87% respectively. Most of the asymmetric cosmic ray intensity decreases (Fds) are related to interplanetary shocks (76.00%) and the related shocks are forward shocks. We have also found positive co-relation with co-relation co-efficient .46 between magnitude of asymmetric cosmic ray intensity decreases (Fds) and speed of associated coronal mass ejections. From the further study it is concluded that asymmetric cosmic ray variations are strongly related to the disturbances in solar wind plasma parameters. Positive co-relation has been found between magnitudes of asymmetric cosmic ray intensity decreases (Fds) and magnitude of jump in temperature of associated JSWT events with co-relation co-efficient is .25 between these two events. Positive co-relation has also been found between magnitude of asymmetric cosmic ray intensity decreases (Fds) and maximum velocity associated JSWV events with co-relation co-efficient .37 between these two events.