GEOMAGNETIC FIELD VARIATIONS AT THE KOLA AND URAL SUPERDEEP BOREHOLES
The paper examines the results of measurements of geomagnetic field variations in the Kola SD-3 satellite at a depth of ~600 m and the Ural SD-4 at a depth of 5970 m. The data of amplitude-frequency analysis are adduced. It is shown that there are no fundamental differences between geomagnetic field variations caused by aurora borealis, registered on the surface and at small depths (the Kola SD-3). While recording variations at substantial depths (the Ural SD-4) the observed discordance with surface measurements may be stipulated by the region geological structure peculiarities (the presence of sources of secondary low and high-frequency components of geomagnetic variations).