Abstract
Yearly average of cosmic ray intensity (CRI) observed at Oulu super neutron monitor (NM) observed during the period of decline phase of solar cycle 24 and rising phase of solar cycle 25 has been studied with yearly average of corresponding solar wind plasma parameters interplanetary magnetic fields (IMF), solar wind plasma pressure (SWPP), solar wind plasma temperature (SWPT) also yearly average of corresponding Alfven Mach number .It is seen that yearly average of cosmic ray intensity is inversely correlated with yearly average of corresponding solar wind plasma parameters interplanetary magnetic fields (IMF) solar wind plasma pressure (SWPP) solar wind plasma temperature (SWPT) and positively correlated with Alfven mach number . We have found high negative correlation with correlation coefficient -0.90 between yearly average of cosmic ray intensity (CRI) and yearly average of interplanetary magnetic fields (IMF). High negative correlation with correlation coefficient -0.63 has been determined between yearly average of cosmic ray intensity (CRI) and solar wind plasma pressure (SWPP) and -0.51 between yearly average of cosmic ray intensity and solar wind plasma temperature (SWPT). High positive correlation with correlation coefficient 0.86 has been determined between yearly average of cosmic ray intensity and yearly average of Alfven mach number.
KEYWORDS Cosmic Ray Intensity (CRI), Solar Wind Plasma Parameters. Alfven Mach Number.
Jitendra Satnami1, Achyut Panday2
1Research Scholar, Department of Physics, A.P. S. University, Rewa-486003, M. P., India
2Department of Physics, Govt. T.R. S College, Rewa-486003, M. P., India