Chromospheric magnetic fields. Observations, simulations and their   interpretation
  The magnetic field of the quiet-Sun chromosphere remains a mystery for solar physicists. The reduced number of chromospheric lines are intrinsically hard to model and only a few of them are magnetically sensitive. In this work, we use a 3D numerical simulation of the outer layers of the solar atmosphere, to asses the reliability of non-LTE inversions, in this case applied to the Ca II 8542 \AA\ line. We show that NLTE inversions provide realistic estimates of physical quantities from synthetic observations. 
J. de la Cruz Rodr\'iguez, H. Socas-Navarro, M. Carlsson and J.   Leenaarts
astro-ph.SR physics.atom-ph