Long-term variations of the cosmic ray north-south anisotropy and the radial cosmic ray gradient at high rigidity

Details Long-term variations of the cosmic ray north-south anisotropy and the radial cosmic ray gradient at high rigidity Long-term variations of the cosmic ray north-south anisotropy and the radial cosmic ray gradient at high rigidity

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5890s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5890-5896.

Physics

14

Interplanetary Magnetic Fields, Magnetic Rigidity, Solar Cosmic Rays, Radiation Distribution, Secular Variations, Solar Activity, Solar Magnetic Field

Scientific paper

Data from the Embudo underground cosmic ray muon telescope from 1965 to 1985 have been analyzed as a function of the polarity of the IMF, B, to examine long-term variations in the cosmic ray north-south anisotropy, B x, the radial heliocentric cosmic ray density gradient. The direction of the cosmic ray north-south anisotropy is shown to be essentially constant over this period, and the extraterrestrial nature of the anisotropy is confirmed. The magnitude of the anisotropy is shown to be only weakly dependent on solar activity and to be independent of the magnetic polarity of the solar dipole which is the source of the IMF B. By inference, it is concluded that the radial heliocentric cosmic ray density gradient at high rigidity does not show a large variation with solar activity or with solar magnetic polarity.

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