Abstract
IN recent years there has been increased interest in micropulsations of the Earth's magnetic field1–4. As a part of a study of the micropulsations with periods of 10–30 sec., stations were established near Borrego, California (33° 21.5′ N., 116° 17′ W.), and near College, Alaska (64° 42′ N., 148° 29.5′ W.). Horizontal coil antennas of 2-m. diameter and 21,586 turns were used. The associated amplifiers had three db. band pass points at 0.04 and 0.4 cycles per second and a limiting senstivity of 0.02 γ.
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CAMPBELL, W., NEBEL, B. Micropulsation Measurements in California and Alaska. Nature 184, 628 (1959). https://doi.org/10.1038/184628a0
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DOI: https://doi.org/10.1038/184628a0
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