This is the first study considering ionospheric currents (both field-aligned current and Hall current) derived from high-resolution magnetic field data of the Swarm constellation in both hemispheres. The prominent auroral electrojets are found to be closely controlled by the solar wind input, but we find no dependence of their intensity on the IMF B_y orientation. An important finding is that all the IMF B_y dependences of FACs and Hall currents practically disappear in the dark winter hemisphere.