Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...421..755v&link_type=abstract
Astronomy and Astrophysics, v.421, p.755-762 (2004)
Astronomy and Astrophysics
Astrophysics
19
Magnetohydrodynamics (Mhd), Sun: Magnetic Fields, Sun: Photosphere
Scientific paper
We compare 3D simulations of photospheric magneto-convection which include a multigroup modelling of the non-grey radiative transfer with simulations based on a grey radiative transfer using the Rosseland mean opacity. While the simulation properties in the solar surface layers around τRoss=1 are very similar both cases, pronounced differences occur both in the temperature structure of magnetic field concentrations in the upper photosphere and in the appearance of strong magnetic fields in brightness maps. The results show that a non-grey treatment of the radiative transfer is mandatory if magneto-convective simulations are to be compared with observational results by calculating synthetic spectra of temperature-sensitive lines originating in the middle and upper photosphere.
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