Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..143..187a&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 143, no. 1, p. 187-196.
Physics
11
Anisotropy, Diurnal Variations, Galactic Cosmic Rays, Solar Magnetic Field, Sunspot Cycle, Amplitudes, Corotation, Magnetic Poles, Maxima
Scientific paper
Results of a detailed study conducted on the long-term changes in diurnal anisotropy of cosmic rays for the two solar cycles (20 and 21) during the period 1965-1990 are presented. It is shown that the amplitude of the anisotropy is related to the characteristics of high- and low-amplitude days. The occurrence of high-amplitude days is found to be positively correlated with the sunspot cycle, while the low-amplitude days are correlated negatively with the sunspot cycle. The variability of the time of maximum of the anistropy indicates that it is essentially composed of two components: one in the 1800 hr (corotation) direction and the other an additional component in the 1500 hr direction, apparently caused by the reversal of the solar polar magnetic field. It is also suggested that the direction of the anisotropy of high- and low-amplitude days contributes significantly to the long-term behavior of the diurnal anisotropy as it produces an additional component of cosmic rays in the radial direction.
Ananth A. G.
Pillai Suresh
Venkatesan D.
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