Abstract
In this present investigation, we study the cosmic ray intensity behavior over the solar minimum of cycle 24, with the ground based ATHN and APTY neutron monitors (NM). In this manuscript we have taken care the comparative approach of CRI variations of two NM with different solar and magnetic parameters (SSN, SFI and B). we have performed the correlative approach to determine the degree of correlation within said parameters and CRI of different cutoff rigidity neutron monitors. During solar minimum cosmic ray intensity has moderate anticorrelation with solar and magnetic parameter B with coefficient -0.43, -0.44, and -0.51 for high rigidity ATHN neutron monitor while for low cutoff rigidity APTY neutron monitor CRI shows strong anticorrelation with the coefficients -0.90, -0.68, and -0.72 respectively. Further we also analyzed the yearly variation of CRI for both the neutron monitors up to establishment phase of cycle 25 (year 2022) and observed that the CRI shows the decrement in the year 2020 through ATHN NM while for APTY NM no such variation observed. The variation of SSN and SFI in respect of CRI are similar but during the study period we observed two peaks in SFI but SSN show smooth curve. Cosmic ray intensity variation is dependent on the type of NM and cutoff rigidity.
Keywords: – Cosmic Ray Intensity, SSN, Solar Flare Index, Neutron Monitor.
Rani Ghuratia1*, Achyut Pandey2, Arvind Dhurve3