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

An inter-comparison 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 from and Haleakala Neutron Monitoring Stations. The annual average values of the first two (daily) harmonic amplitudes and phases for neutron monitor data due to the change in the annual average magnitudes of the sunspot number and Ap index. Significant positive correlations among diurnal amplitude of both stations with Rz and Ap index have been found. The largest amplitudes are observed during the declining phase of solar activity. The semi-diurnal amplitude for Kiel and Haleakala neutron monitor stations have been found negatively correlated with sunspot number and Ap index, while 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 mechanism in producing significant correlations.