Unusual Cosmic-Ray Intensity Fluctuations Observed at Southern Stations during October 21-24, 1957

Abstract
Observations are reported from four southern stations of cosmic-ray intensity fluctuations during the period October 21-24, 1957. These fluctuations exhibit unusual features which suggest the existence of a short-lived and highly directional anisotropy of the primary radiation during the period immediately preceding a Forbush-type decrease.

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