РусThe analysis of the Pleshchenitsi (MNK) observatory data obtained within 1969 – 1989 has been carried out to estimate the response functions in the period from 7 to 110 days. The 1D inversions of these results together with the results for daily and deep magnetotelluric responses published previously allowed the estimation of the mantle conductivity structure in the depth range of 150 to 2000 km. The conductive zones have been detected in the depth ranges of 280 to 380 and 700 to 900 km. The asthenosphere of about 2 kS conductance can probably exist below a depth of 100 km.