Study of Short term Asymmetric Cosmic Ray Intensity decreases with Coronal Mass Ejections and Solar Flare

Abstract:

We have analyzed asymmetric cosmic ray intensity decreases ≥4%, observed during the period of 1997 to 2013 with Coronal mass ejections and X-Ray solar flares. We have found total numbers of asymmetric cosmic ray intensity decreases (Fds) are 74. We have 67 CMEs events out of these 67 events 62 (92.54%) asymmetric cosmic ray intensity decreases (Fds) have been found to be associated with coronal mass ejections .The majority of associated CMEs are halo CMEs, the association rate of H Type and P types CMEs have been found 85.48% and 14.52 % respectively. Further we have observed that out of 74 asymmetric cosmic ray intensity decreases (Fds), 69 (93.24%) are associated with X ray solar flares of different categories and majority of the associated solar flares are M-Class solar flares. From the study of asymmetric cosmic ray intensity decreases (Fds) with speed of associated CMEs, we have determined positive correlation with correlation coefficient 0.46 between magnitudes of asymmetric cosmic ray intensity decreases (Fds) and speed of associated CMEs.

Keywords: Coronal mass ejections, Solar flares, Asymmetric cosmic ray intensity.

Dr. Preetam Singh Gour, Dr. R. L. Urmaliya, Dr. Shiva Singh

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