Research Article Open Access

Variations of Upper Cut-off Rigidity Of Cosmic Ray Diurnal Anisotropy

Abstract

Using the experimental data of the high counting rate neutron monitor, the solar diurnal anisotropy of galactic cosmic rays has been investigated for the period 1986-2006.The most probable value of the upper cut-off rigidity of the diurnal variation shows a 22- years magnetic cycle variations with the lowest value at the sunspot minima of A>0 phase. Upper cut-off rigidity in solar cycle 22 and 23 is found to vary between 40 GV to about 100 GV. This is derived by using the minimum variance analysis between a few high and low latitude stations by including the set of variation coefficients. The derived amplitude of the diurnal anisotropy (in space) varies with a period of one solar activity (11-year cycle, whereas, the phase of the diurnal anisotropy displays an obvious 22-year magnetic cycle

Ambika Singh, Divya Dubey, Rukmani Pratap Singh & Anil Kumar Tiwari

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