The nature of the variation of cosmic ray anisotropy with solar activity cycle

Details The nature of the variation of cosmic ray anisotropy with solar activity cycle The nature of the variation of cosmic ray anisotropy with solar activity cycle

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ge%26ae..21..536s&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 21, May-June 1981, p. 536-538. In Russian.

Physics

1

Anisotropy, Cosmic Rays, Solar Activity Effects, Solar Cycles, Solar Wind Velocity, Coronal Holes, Diurnal Variations, Galactic Radiation

Scientific paper

A possible explanation of the observed anomalies in the diurnal variation of galactic cosmic rays occurring during alternate solar activity minima is presented in terms of the evolution of coronal and solar wind velocity with the solar cycle. It is pointed out that high-speed solar wind streams issuing from coronal holes in the solar polar regions have been shown to be capable of acting as channels for the transport of galactic cosmic rays from regions undisturbed by the solar wind into near-solar space, particularly during solar activity minima, when the areas of polar coronal holes are observed to be at their greatest. Scattering on magnetic inhomogeneities and convective transfer is proposed to lead to an observable elevation in cosmic ray intensities and a decrease in their intensity gradient at the orbit of the earth, the magnitude of which would depend on conditions in the interplanetary medium, which in turn depend on solar wind velocity. As the solar wind velocity is known to exhibit a 22-year periodicity, increasing sharply during the decline phases of even cycles, the combined effects of high-speed streams and solar wind velocity variations would be capable of accounting for the observed decrease in diurnal variations and the shift in the time of the galactic cosmic ray maximum.

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