Origin of the solar-magnetic-cycle dependent semiannual variation in galactic cosmic-ray flux

Details Origin of the solar-magnetic-cycle dependent semiannual variation in galactic cosmic-ray flux Origin of the solar-magnetic-cycle dependent semiannual variation in galactic cosmic-ray flux

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..969l&link_type=abstract

Geophysical Research Letters, vol. 5, Nov. 1978, p. 969-972.

Physics

6

Cosmic Rays, Galactic Radiation, Interplanetary Magnetic Fields, Solar Magnetic Field, Annual Variations, Density Distribution, Diffusion Coefficient, Flux Density, Lines Of Force

Scientific paper

The paper points out that the general dipole-like symmetry of the interplanetary magnetic field produces a heliospheric latitude variation in the density of modulated galactic cosmic rays. This density variation gives the observed semiannual variation in the galactic cosmic-ray flux observed at earth, which changes phase with the sign of the solar magnetic field. An explicit expression is obtained for the symmetric cosmic-ray density gradient in the direction perpendicular to the solar equatorial plane and used to derive a value for the cosmic-ray diffusion coefficient perpendicular to the average interplanetary magnetic field.

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