Cosmic Ray Intensity Variations in Relation with Solar Flare Index and Sunspot Numbers |
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| Authors: | A P Mishra Meera Gupta V K Mishra |
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| Institution: | (1) Department of Physics, A. P. S. University, Rewa, 486003, Madhya Pradesh, India |
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| Abstract: | From the monthly data of cosmic ray intensity (CRI), sunspot numbers (SSN) and solar flare index (SFI), an attempt has been
made to study the relationship between CRI and solar activity (SA) parameters SSN and SFI. The correlation between SA parameters
and CRI for different neutron monitoring stations having low, middle and high cut-off rigidity has been investigated. The
anti-correlation between SA and CRI is found to exist with some time lag. Based on the method of minimizing correlation coefficient
and time-delayed component method, the observed time-lag between SA parameters (SSN and SFI) and CRI has been found to be
large for odd solar cycles in comparison to even solar cycles. The results of time-lag analysis between CRI and SSN and between
CRI-SFI have also been compared. The findings of correlative study between CRI and SSN are in agreement with earlier results,
while the CRI-SFI relationship provides new insights to understand the solar modulation of cosmic rays. |
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