  The space mission STEREO will provide images from two viewpoints. An
important aim of the STEREO mission is to get a 3D view of the solar corona.
  We develop a program for the stereoscopic reconstruction of
  3D coronal loops from images taken with the two STEREO spacecraft.
  A pure geometric triangulation of coronal features leads to ambiguities
because the dilute plasma emissions complicates the association of features in
image 1 with features in image 2. As a consequence of these problems the
stereoscopic reconstruction is not unique and multiple solutions occur.
  We demonstrate how these ambiguities can be resolved with the help of
different coronal magnetic field models (potential, linear and non-linear
force-free fields). The idea is that, due to the high conductivity in the
coronal plasma, the emitting plasma outlines the magnetic field lines.
  Consequently the 3D coronal magnetic field provides a proxy for the
stereoscopy which allows to eliminate inconsistent configurations.
  The combination of stereoscopy and magnetic modelling is more powerful than
one of these tools alone. We test our method with the help of a model active
region and plan to apply it to the solar case as soon as
  STEREO data become available.
