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Paper: Zeeman-Tomography of a Quiet Sun Region
Volume: 405, Solar Polarization 5: In Honor of Jan Olof Stenflo
Page: 287
Authors: Carroll, T.A.; Kopf, M.
Abstract: The thermodynamic and magnetic field structure of the solar photosphere is analyzed by means of a novel 3-dimensional spectropolarimetric inversion and reconstruction technique. On the basis of high-resolution, mixedpolarity magnetoconvection simulations we used an artificial neural network (ANN) model to approximate the nonlinear inverse mapping between synthesized Stokes spectra and the underlying stratification of atmospheric parameters like temperature, LOS velocity and LOS magnetic field. This approach not only allows us to incorporate more reliable physics into the inversion process, it also enables the inversion on an absolute geometrical height scale which allows the subsequent combination of individual line-of-sight stratifications to obtain a complete 3-dimensional reconstruction (tomography) of the observed area. The MHD data as well as the ANN inversion have been adopted to Hinode/SP data. For the first time we show a tomographic reconstruction of a quiet sun region observed by Hinode. The reconstructed area covers a field of approximately 12, 000 × 12, 000 km and a height range of 510 km in the photosphere. An enormous variety of small and large scale structures can be identified in the 3-D reconstruction. The low flux region (Bmag = 20 G) we analyzed exhibits several tube like structures with magnetic field strengths of some hundred Gauss. Most of these structures rapidly loose their strength with height and only a few larger structures can retain a higher field strength to the upper layers of the photosphere.
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