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In the present work, we investigate the formation of Stokes profiles andspectro-polarimetric diagnostics in an active region plage near the limb. Weuse 3-D radiation-MHD simulations with unipolar fields of an average strengthof 400 G, which is largely concentrated in flux tubes in which the fieldreaches typical kilo-Gauss values. We generate synthetic Stokes spectra byradiative transfer calculations, then we degrade the simulated Stokes signal toaccount for observational conditions. The synthetic data treated in this mannerare compared with and found to roughly reproduce spectro-polarimetrichigh-resolution observations at Mu=0.39 obtained by the SOUP instrument withthe Swedish 1-m Solar Telescope at the beginning of 2006.

Spectropolarimetric Diagnostics at the Solar Photosphere near the Limb