Abstract
Annual and semiannual variations in galactic cosmic ray intensity have been computed for the period 1954--1973. These variations show a fairly constant phase over several years. However, an abrupt reversal of the direction of both vectors, representing the annual and the semiannual variations, is associated with the reversal of the polarities of the solar polar magnetic fields, which occurs near sunspot maximum. Furthermore, it is well known that the annual and semiannual variations may be related to the first- and second-order derivatives, with respect to the solar latitude, of the cosmic ray density. Consequently, the cosmic ray gradient, perpendicular to the solar equatorial plane, regularly changes its direction at the solar activity maximum, displaying a 22 year periodicity.
Published Version
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