Variation in Diurnal Phase of Cosmic Ray Intensity during 1986–2017

Abstract

Variations of cosmic ray diurnal phase for Oulu, Apatity, Kiel and Moscow neutron monitoring stations through harmonic analysis by Fourier technique have been investigated in the present study. The period of investigation has been taken to be the period of solar cycle 22, 23 and major portion of solar cycle 24; i.e. 1986 to 2017. Diurnal phase is found have tendency to shift towards later hour direction during 1989, 2000 and 2014, which are the years of maximum solar activity; as compared to the phase values found in minimum solar activity period; i.e., during years 1986, 1996 and 2008.

Keywords: Cosmic ray intensity, solar cycle, earlier hour, later hour, diurnal phase

Cite this Article

Arvind Dubey, Santosh Kumar, Dubey SK. Variation in Diurnal Phase of Cosmic Ray Intensity during 1986–2017. Research & Reviews: Journal of Physics. 2018; 7(3): 20–23p.