Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35...45a&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, Jan. 1987, p. 45-50.
Physics
22
Anisotropy, Cosmic Rays, Diurnal Variations, Heliosphere, Diffusion Coefficient, Interplanetary Magnetic Fields, Muons, Neutrons, Particle Telescopes
Scientific paper
The data on long-term changes in the solar diurnal variation of cosmic rays observed at Deep River with a neutron monitor and at Embudo with an underground muon telescope during the period 1965-1976 are reviewed. It is shown that the model proposed by Erdos and Kota (1979) cannot explain the systematic changes seen in the data collected during 1971-1976. An insight gained from the diffusion-convection model makes it possible to obtain a unique solution for the K-parallel Gr value in terms of the parameters applicable to the solar wind and the diurnal anisotropy. This makes it possible to calculate the rigidity (R) dependence of the diffusion coefficient K-parallel. It is found that K-parallel = 1.37 x 10 to the 18th R exp 0.6 sq m/s, where R is in gigavolts, and K-perpendicular = 1.08 x 10 to the 18th sq m/s.
Ahluwalia Harjit S.
Riker James F.
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