Ground Level Enhancements and their Relation with  Coronal Mass Ejections and Disturbances in Solar  Wind Plasma Parameters

P.L.Verma; Gajendra Saxena; A.K.Saxena; P.K .Chamadiya; Deepti shukla

Volume : III, Issue : VI, June - 2013

Ground Level Enhancements and their Relation with Coronal Mass Ejections and Disturbances in Solar Wind Plasma Parameters

P. L. Verma, Gajendra Saxena, A. K. Saxena, P. K . Chamadiya, Deepti Shukla

Abstract :

We have studied Ground Level Enhancements in cosmic ray intensity magnitude ≥100% observed during the period of 2000–2012 with Coronal Mass Ejections and disturbances in solar wind plasma parameters (solar wind velocity, density and interplanetary magnetic field) .We have found that all the Ground Level Enhancements are associated with halo and partial halo coronal mass ejections .The association rate of halo and partial halo coronal mass ejections have been found 81.18% 18.18% and respectively .We have determined negative correlation with correlation coefficient –0.47 between magnitude of Ground Level Enhancement and speed of associated CMEs .Further we have concluded Ground Level Enhancements are closely associated with the disturbances in solar wind plasma parameters. We have determined negative co–relation between magnitudes of Ground Level Enhancements and peak value of jump in solar wind plasma density ,average interplanetary magnetic field and positive correlation between magnitude of Ground Level Enhancements and peak value of solar wind plasma velocity with co–relation co–efficient, 0.65 between magnitude of Ground Level Enhancements and peak value of jump in solar wind plasma velocity , –0.42 between magnitude of Ground Level Enhancements and peak value of jump in average interplanetary magnetic field and –0.25 between magnitude of Ground Level Enhancements and peak value of solar wind plasma density