Phase reversals in the polar magnetic fields of the sun and in the annual and semiannual variations in cosmic ray intensity

Details Phase reversals in the polar magnetic fields of the sun and in the annual and semiannual variations in cosmic ray intensity Phase reversals in the polar magnetic fields of the sun and in the annual and semiannual variations in cosmic ray intensity

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..712a&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 712-718. Research supported by the Consiglio Nazionale delle Ricerche

Astronomy and Astrophysics

Astrophysics

3

Annual Variations, Cosmic Rays, Polarity, Solar Cycles, Solar Magnetic Field, Fourier Analysis, Interplanetary Magnetic Fields, Particle Flux Density, Sunspots

Scientific paper

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 semiannual variations, is associated with 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 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.

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