Note on an apparent highly-sheared magnetic field structure

Using Potsdam vector magnetograms and a force-free model, we have investigated the magnetic field structure of the active region BBR 18474 of 1982 July 15, and 1982 July 16. By comparison of the azimuths of the current-free model of the magnetic field structure in the central part of this active region with the map of the azimuth values estimated from the observation we find a good qualitative agreement. Additional earlier results have show, that the appearence of highly sheared magnetic field structure near the neutral line in the central part of this active region may be a simulated effect generated by a subphotospheric current system. (author). 6 refs