Cosmic ray perpendicular gradient during 1962-1972

Abstract

An analysis of the perpendicular gradient of galactic cosmic rays performed on the basis of the estimate of the annual and semiannual variations of the cosmic ray intensity is reported. The daily cosmic ray intensity data detected by the Deep River neutron monitors have been used for the period 1962–1972. The perpendicular gradient can be separated into two components which are asymmetrical and symmetrical, respectively, with respect to the solar equatorial plane. The asymmetrical gradient component is quasi-stationary over the whole period, while the symmetrical one reverses its direction once. Then in northern and southern regions of the solar modulating cavity the perpendicular gradient displays different characteristics in both value and direction which depend on the solar cycle phase.