Simulation of long-term cosmic-ray intensity variation |
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Authors: | H Mavromichalaki E Marmatsouri A Vassilaki |
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Institution: | (1) Physics Department Nuclear and Particle Physics Section, University of Athens, 10680 Athens, Greece |
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Abstract: | Selecting the most appropriate source functions among the various solar, interplanetary and terrestrial activity indices we have attempted to reproduce to a certain degree the long-term modulation of galactic cosmic-rays. For this study monthly cosmic-ray data from nine world-wide neutron monitor stations for the period 1975–1985 have been analysed. The empirical formula which has been used to compute the long-term cosmic-ray variations follows the observations fairly well.It is noteworthy that the residuals in the cosmic-ray intensity between that observed and that calculated by this empirical formula exhibits a still remaining short-term variation in all stations of 2.7 and 3.7 months. Possible interpretations of these observed periodicities related to galactic origin are given. |
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