Summary
The phase relationships between variations in cosmic-ray intensity and geomagnetic activity were studied for the period June, 1957 — August, 1958. The results indicate a definite difference in the relationship for periods of high and of low solar activity. It is suggested that this difference may be due to the more frequent occurrence of severe Forbush decreases during periods of maximum solar activity.
Riassunto
Sono state studiate, per il periodo di tempo intercorrente fra il Giugno 1957 e l’Agosto 1958, le relazioni di fase fra le variazioni dell’intensità dei raggi cosmici e dell’attività geomagnetica. I risultati indicano una differenza definita di tali relazioni per i periodi di intensa e debole attività solare. Si suggerisce che questa differenza possa essere dovuta alla maggiore frequenza di forti decrementi di Forbush durante i periodi di massima attività solare.
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References
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The cosmic-ray equipment in operation at the Magnetic Observatory, Hermanus, is the property of the South African Council for Scientific and Industrial Research.
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Van Der Walt, R. The relation between cosmic-ray intensity and geomagnetic activity during periods of high and low solar activity. Nuovo Cim 13, 936–943 (1959). https://doi.org/10.1007/BF02724821
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DOI: https://doi.org/10.1007/BF02724821