Trains of diurnal waves in the muonic component at 70 MWE have been found during the preliminary phases of some cosmic-ray decreases. A predecrease the day immediately preceding a Forbush decrease has repeatedly been reported from neutron monitor observations. Our analysis indicated that underground data reveal this effect earlier and for a longer period. This is consistent with the interpretation of a Forbush decay as the result of the advance of a shock front.
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Castagnoli et al. (1969) studied this question.
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