Abstract
Disturbance of electric power‐systems during the great magnetic storm of March 24, 1940, has created a new interest in the study of geomagnetic phenomena. Operation of telegraph‐instruments by electric currents induced by geomagnetic changes was observed shortly after the art of wired telegraphy had been introduced, and the effects of magnetic disturbances on the ionosphere, and consequently on radio transmission, were recognized with the advent of short‐wave transmission. But there have never been any previous reports of interference with power‐transmission. Clearly, only the most violent of magnetic storms are capable of affecting power‐systems for none of the other great storms of the present sunspot maximum gave rise to noticeable effects.
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