Radiation transfer through a model sunspot

Details Radiation transfer through a model sunspot Radiation transfer through a model sunspot

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..221l&link_type=abstract

Solar Physics, vol. 63, Sept. 1979, p. 221-235.

Physics

22

Atmospheric Models, Polarization Characteristics, Radiative Transfer, Stellar Models, Sunspots, Line Spectra, Penumbras, Photosphere, Solar Spectra, Thermodynamic Equilibrium

Scientific paper

A cylindrically symmetric model for a sunspot atmosphere using the similarity principle of Schlueter and Temesvary for the magnetic field configuration is presented. The equations of magnetostatic equilibrium are used, augmented by a radial Evershed flow. The LTE radiative transfer equations for the Stokes vector were solved under a variety of conditions for a ray emerging from a typical penumbral point. The contribution from isolated lines to the broadband circular polarization in sunspot penumbrae is evaluated using a more realistic model sunspot atmosphere than has hitherto been considered. Results indicate that the inclusion of a velocity field along the magnetic field vector is unable to give a net circular polarization of sufficient magnitude, although the variation with the angle between the line-of-sight and the magnetic field vector is in qualitative agreement with observations. The corresponding results for the net linear polarization are satisfactory.

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