Micropulsation Measurements in California and Alaska

Abstract

IN recent years there has been increased interest in micropulsations of the Earth's magnetic field^1–4. 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.