Abstract
By the use of very large loops of wire, many square miles in area, nearly simultaneous micropulsations were recorded in Arizona and New Jersey during the initial phase of a magnetic storm. Evaluation of the two records (15 minutes' recording time) by cross correlation showed a time difference in arrival of common signals of 2 to 3 seconds. A similar difference was observed for the sudden commencement itself. The method used is simple and relatively unaffected by interference. The maximum sensitivity, 1.7×10−4 gamma sec−1 mm−1, could be used only during magnetically quiet periods. At two other sudden commencements, a remarkable resemblance was found in the fine details at the variations present. The over-all study includes effects from both natural and man-made causes. Another paper will discuss the man-made effects.
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