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FINE STRUCTURE OF THE EARTH'S FUNDAMENTAL SPHEROIDAL MODE 0S2 IN GEOMAGNETIC VARIATIONS
Abstract
As the initial data, we used the results of recording the Earth's magnetic field at the Geophysical observatory "Mikhnevo" of the Institute of Geospheres Dynamics (54.959?N, 37.766?E), carried out in the period 2010-2015. On the basis of the results of instrumental observations, it is shown that in the spectra of geomagnetic variations the quasiharmonic component is clearly distinguished, the frequency of which is close to the basic spheroidal mode of the Earth 0S2. In periods of 15 days after three major earthquakes, in the absence of strong magnetic disturbances, a fine structure of the 0S2 mode in the geomagnetic variations in the form of singlets is established. The established features of the spectrum of geomagnetic variations develop a new method for studying the deep structure of the Earth, the properties of internal geospheres, estimating the viscosity of the outer core of the Earth, describing the geomagnetic dynamo, developing new models of the motion of the inner core of the Earth, and the dynamics of current systems in the outer (liquid) core.
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