Study of High Energy Cosmic Ray Anisotropies with Solar and Geomagnetic Disturbance Index

C. M. Tiwari, D. P. Tiwari
2013 International Journal of Astronomy  
An inter-co mparison of the first two harmonics has been made so as to understand the basic reason for the occurrence of cosmic ray anisotropies during the period 1989-2004 and 1991 -2004 using the Neutron monitor data fro m Kiel and Haleakala Neutron Monitoring Stations. The annual average values of the first two (daily) harmonic amp litudes and phases for neutron monitor data due to the change in the annual average magnitudes of the sunspot number and Ap index. Significant positive
more » ... s among diurnal amplitude of both stations with Rz and Ap index have been found. The largest amp litudes are observed during the declin ing phase of solar activ ity. The semi-d iurnal amplitude for Kiel and Haleakala neutron monitor stations have been found negatively correlated with sunspot number and Ap index, wh ile the semi-diurnal phase is positively correlated with sunspot number and Ap index. Examinations and analysis of simultaneous variations in cosmic ray anisotropies along with solar and geomagnetic disturbance index has lead us to identify possible mechanis m in producing significant correlat ions.
doi:10.5923/j.astronomy.20120105.01 fatcat:brel65e2gvf7fcyswrkgugzm7q