[en] Geomagnetic field variations caused by variations of Bsub(z), a component of interplanetary magnetic field (IMF), have been investigated. The experimental data were obtained with the help of the ''Explorer-28'' satellite during the period from 9.1 to 11.30, 1965. It has been found that when a negative pulse in the Bsub(z) component occurs, currents directed sunwards appear in the polar region, and those directed eastwards appear at the equator. Negative pulses in the Bsub(z) component cause currents directed anti-sunwards in the polar region, and those directed westwards at the equator. In the former case the system of currents may be regarded as DP-2 system, in the latter as anti-DP-2 system. It is shown that the magnitude of geomagnetic field fluctuations depends on variations of the IMF Bsub(z) component in a linear manner