Study Of Symmetric And Asymmetric Short Term Cosmic Ray Intensity Decreases From 1997 To 2013

Abstract:

For this work we have to consider oulu super neutron monitor data of cosmic ray intensity decreases. For this period 47 symmetric cosmic intensity decreases and 74 asymmetric cosmic ray intensity decreases have been found. Now we have found that out of these events we have no data of CMEs for 5 symmetric and 7 asymmetric cosmic ray events for association with coronal mass ejections (CMEs). Again we found that these cosmic ray intensity decreases are well correlated with x-ray solar flares of different categories. Most of the asymmetric cosmic ray intensity decreases are found to be associated with M class x-ray solar flare and most of the symmetric cosmic ray intensity decreases are found to be associated with C class x-ray solar flares. Further we analyze that asymmetric cosmic ray intensity decreases are well correlated with geomagnetic storms and interplanetary shocks as compared to symmetric cosmic ray intensity decreases. The associated interplanetary shocks are forward shocks.  

Keywords: – Cosmic ray intensity, Interplanetary shocks, Solar flares.

Preetam Singh Gour, Arun Kumar, Shiva Soni

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