Field-aligned currents and magnetic disturbances in the dayside polar region

Field-aligned currents in the day-time cusp-region are regarded as the superposition of various current sheets under the influence of different solar wind parameters. The principal feature of this pattern is a specific region 3 of field-aligned currents located poleward of region 1 and affected by both the azimuthal and northward components of the interplanetary magnetic field. It is shown that recent measurements carried out on the TRIAD satellite (Saflekos and Potemra, 1979) unambiguously point to the existence of region 3. The data on the transverse magnetic disturbances supplied by S3-2 satellite (Doyle et al., 1981) accord with our model on taking into account the relations between the IMF parameters and the field-aligned current intensity.