| Presenter: | Lotfi Yelles Chaouche |
| Affiliation: | Max Planck Institute for solar system research |
| Title: | Spectro-polarimetric diagnostics near the solar limb: Simulations versus high-resolution observations |
| Authors: | L. Yelles Chaouche, S.K. Solanki, L. Rouppe van der Voort, M. van Noort |
| Form: | talk |
| Abstract: | In the present work, we investigate the detailed formation of Stokes profiles and the physical interpretation spectro-polarimetric diagnostics in an active region plage near the limb. We use 3D radiation-MHD simulations with unipolar fields of an average strength of 200~G and 400~G, which is distributed between weak fields and flux tubes in which the field reaches typical Kilo-Gauss values. We generate synthetic Stokes spectra by radiative transfer calculations, then we degrade the simulated Stokes signal to account for observational conditions. The synthetic data treated in this manner roughly reproduce spectro-polarimetric high resolution observations at $\mu=0.39$ obtained by the SOUP instrument with the Swedish tower telescope at the beginning of 2006 by L.\ Rouppe van der Voort and M.\ van Noort. After establishing the similarity between observations and simulations, we investigate in more detail individual features in the simulations corresponding to flux tubes, and identify the properties and origin of their Stokes signatures. |
| Session: | 3. Nature of solar magnetic fields as revealed by polarimetry |
| Presentation date: | Tuesday 18th September |
| Presentation time: | 12:15:00 |