Abstract
The orientations of the vector changes ΔF in the total magnetic field for time intervals of twenty minutes are plotted on polar diagrams for three magnetic stations in the Soviet Arctic. For two of these stations, Tikhaya Bay and Cape Chelyuskin, which are in the auroral zone the vector changes are oriented along a line. This suggests that the sources of the field are linear current elements. At the third station, Tixie Bay located south of the auroral zone, the vector changes lay on a plane whose orientation appears to be related to the contact between a Precambrian platform and Mesozoic folding. A large, discrete magnetotelluric event is described which occurs at Cape Chelyuskin one hour and 54 minutes before it occurs at Tikhaya Bay.
