A MODEL OF GEOMAGNETIC MICROPULSATIONS WITH LONG PERIODS

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Abstract
A physical process whereby a hydromagnetic oscillation of a magnetic line of force passing through the auroral zones gives rise to a system of ionospheric currents is described in this paper. Geomagnetic micropulsations, at least in middle and low latitudes, are claimed to be due to ionospheric currents thus produced. Observational evidence in support of this viewpoint for micropulsations in the daylight hemisphere is provided by the solar eclipse effect that the intensity of micropulsations is weakened in the eclipsed zone. The phase relationship between micropulsations in the north–south component and oscillations in the received frequency of a radio wave which is emitted from a station with a stable frequency of the order of several to tens of megacycles, and is propagated through the ionosphere, is correctly interpreted by the above theory.

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