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Three-Dimensional Radiative Transfer with Multilevel Atoms

  • P. Fabiani Bendicho
  • J. Trujillo Bueno
Part of the Astrophysics and Space Science Library book series (ASSL, volume 243)

Abstract

The efficient numerical solution of Non-LTE multilevel transfer problems requires the combination of highly convergent iterative schemes with fast and accurate formal solution methods of the radiative transfer (RT) equation. This contribution begins presenting a method for the formal solution of the RT equation in three-dimensional (3D) media with horizontal periodic boundary conditions. This formal solver is suitable for both, unpolarized and polarized 3D radiative transfer and it can be easily combined with the iterative schemes for solving non-LTE multilevel transfer problems that we have developed over the last few years. We demonstrate this by showing some schematic 3D multilevel calculations that illustrate the physical effects of horizontal radiative transfer. These Non-LTE calculations have been carried out with our code MUGA 3D, a 3D multilevel Non-LTE code based on the Gauss-Seidel iterative scheme that Trujillo Bueno and Fabiani Bendicho (1995) developed for RT applications.

Key words

line: formation polarization radiative transfer methods: numerical Sunchromosphere stars: atmospheres 

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • P. Fabiani Bendicho
    • 1
  • J. Trujillo Bueno
    • 1
  1. 1.Instituto de Astrofísica de CanariasLa Laguna, TenerifeSpain

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