On the Comparison of Nonlinear Force-free Models Based on Vector-magnetograms from Different Instruments

We investigate the three-dimensional structure of the magnetic field in the outer solar atmosphere with the help of photospheric magnetic vector maps based on measurements from the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory and of the Solar Optical Telescope Spectral-polarimeter (SP) on board the Hinode spacecraft. HMI and SP magnetic vector maps of NOAA AR 11382 on 21-22 December 2011 are used as lower boundary condition for nonlinear force-free field reconstructions. We compare the resulting three-dimensional coronal magnetic field models in terms of the energy content, the magnetic pressure, the vertical distribution of the magnetic field and associated electric current density, as well as the magnetic field line configuration and compare the latter to the loops visible in coronal images from the SDO Atmospheric Imaging Assembly.