Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-29
Published in 1999 in the book Solar Polarization, edited by K.N. Nagendra and J.O. Stenflo. Kluwer Academic Publishers, 1999.
Astronomy and Astrophysics
Astrophysics
12 pages and 6 figures
Scientific paper
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.
Bendicho Fabiani P.
Trujillo Bueno Javier
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