Ground level enhancement and solar wind plasma parameters during near solar maximum of solar cycle 23

Abstract

Ground level Enhancements are sudden sharp and short-lived increase in cosmic ray intensities recorded by super neutron monitors and are known to take place during powerful solar eruptions. We have studied Ground Level Enhancement observed during the period of near solar maximum 23 with coronal mass ejections, X-ray solar flares, and disturbances in solar wind plasma parameters such as solar wind plasma pressure (SWPP) solar wind plasma velocity (SWPV) and interplanetary magnetic fields (IMF B). We have determined that all the GLE are associated with coronal mass ejection and most of them are halo coronal mass ejections ,Further we have obtained that these GLEs are associated with hard X-ray solar flares  and disturbances in solar wind plasma parameters We have obtained positive correlation with correlation coefficient 0.41,between maximum percentage intensity Imax (%) of GLEs and peak value of associated disturbances in interplanetary magnetic fields 0.31 between maximum percentage intensity Imax (%) of GLEs and magnitude of associated disturbances in interplanetary magnetic fields .Large positive correlation with correlation coefficient 0.6 1 has been determined, between maximum percentage intensity Imax (%) of GLEs and peak value of associated disturbances in solar wind plasma velocity and positive correlation with correlation coefficient 0.39 between maximum percentage intensity Imax (%) of GLEs and magnitude of associated disturbances in solar wind plasma velocity .Further Large positive correlation with correlation coefficient 0.87  has been determined, between maximum percentage intensity Imax (%) of GLEs and peak value of associated disturbances in solar wind plasma pressure and 0.83  between maximum percentage intensity Imax (%) of GLEs and magnitude of associated disturbances in solar wind plasma pressure . 

Keywords: – Ground Level Enhancements (GLEs), Solar wind plasma velocity (SWPV), Solar wind plasma pressure (SWPP), Interplanetary magnetic fields (IMFB).

Chitranshi Tiwari^1*, Deepti Shukla², Rajni Tiwari³, P. L. Verma⁴