Statistical Study Of Asymmetric Cosmic Ray Intensity Decreases With Interplanetary Magnetic Field And Solar Wind Plasma Parameters

Abstract

For this study we have to consider asymmetric cosmic ray intensity decreases during 1997 to 2013. We have observed 74 asymmetric cosmic ray intensity decreases for this duration, out of which 87.83% are associated with jump in interplanetary magnetic field (JIMF). Further we inferred that out of 74, 94.59% asymmetric cosmic intensity decreases are associated with solar wind plasma parameters (density and pressure). From the analysis we have found that the magnitude of asymmetric cosmic ray intensity decreases is correlated with peak value of JIMF and magnitude of JIMF events with correlation coefficients 0.30 and 0.32 respectively. Further magnitude of asymmetric cosmic ray intensity decreases also correlated with jump in solar wind plasma density (JSWD) events and jump in solar wind plasma pressure (JSWP) events, correlation coefficient of magnitude of asymmetric cosmic ray intensity decreases with peak value and magnitude of JSWD events is 0.28 and 0.25. Correlation coefficient of magnitude of asymmetric cosmic ray intensity decreases with peak value and magnitude of JSWP events is 0.45 and 0.43.

Keywords: – Interplanetary magnetic field, solar wind plasma parameters, cosmic ray intensity decreases.

Dr. Preetam Singh Gour, Dr. Shiva Soni, Dr. Arun Kumar

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