Field-aligned currents in the dayside cusp and polar cap region during northward
IMF.

The high accuracy of the magnetic measurements from the low altitude polar orbiting
satellites Oersted and CHAMP, makes it possible to uncover new aspects of  solar wind
magnetosphere interaction during northward IMF. Compared to previous high accuracy
measurements, these satellites have the advantage that they frequently pass the
day-side cusp and polar cap in a noon-midnight orbit, which makes them highly
suitable for studying the FAC-pattern during northward IMF conditions. Here we study
the relationship between the NBZ-currents in the polar cap and the IMF By driven
currents in the dayside cusp. We make a statistical study of single passes, based on
the infinite sheet assumption, and - for a single event - we explore the possibility
to use simultaneous passes of two crossing satellites to relax this
assumption. In addition we compare with a MHD-simulation performed at the CCMC and
find a good correspondence with the observations and their interpretation.