Abstract
The 11-year modulation of cosmic-ray intensity is studied using the data from nine world-wide neutron monitoring station over the period 1965–1975. From this analysis the following relation among the modulated cosmic-ray intensityI, the relative sunspot numberR, the number of proton eventsN p and the geomagnetic indexA p has been derived which describes the long-term modulation of cosmic rays
whereC is a constant which depends on the rigidity of each station, andK is a coefficient related to the diffusion coefficient of cosmic rays and its transition in space. The standard deviation between the observed and calculated values of cosmic-ray intensity is about 5–9%. This relation has been explained by a generalization of the Simpson solar wind model which has been proved by the spherically symmetric diffusion-convection theory.
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Xanthakis, J., Mavromichalaki, H. & Petropoulos, B. Cosmic-ray intensity related to solar and terrestrial activity indices in solar cycle No. 20. Astrophys Space Sci 74, 303–317 (1981). https://doi.org/10.1007/BF00656441
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DOI: https://doi.org/10.1007/BF00656441