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This letter is to report an interesting investigation being undertaken to determine the source of micropulsations in the earth's magnetic field [Campbell, 1959]. At a site 25 miles from College, Alaska, a 2-meter-diameter loop antenna of 21,586 turns is used as a magnetic field sensing unit for pulsations in the range of 1- to 50- sec period. At College, pulsating auroras are measured with lens, interference filter, photomultiplier system. Figure 1 indicates the 3914 A auroral pulsations from 70° of sky coincident with magnetic field micropulsations. Similar results for the 5577 A wavelength have been obtained. A complete report will appear following a thorough study of the phenomenon through the winter of 1958-1959.
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Wallace H. Campbell (1960) studied this question.
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