An operator perturbation method for polarized line transfer. VI. Generalized PALI method for Hanle effect with partial frequency redistribution and collisions

Details An operator perturbation method for polarized line transfer. VI. Generalized PALI method for Hanle effect with partial frequency redistribution and collisions An operator perturbation method for polarized line transfer. VI. Generalized PALI method for Hanle effect with partial frequency redistribution and collisions

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...400..303f&link_type=abstract

Astronomy and Astrophysics, v.400, p.303-317 (2003)

Astronomy and Astrophysics

Astrophysics

17

Line: Formation, Polarization, Radiative Transfer, Scattering, Methods: Numerical, Sun: Atmosphere

Scientific paper

A generalized iteration method is presented to solve the polarized line transfer equation for a two-level-atom in an arbitrarily oriented, weak magnetic field. The polarized redistribution matrix employed accounts self-consistently for collisions as well as the presence of a weak magnetic field responsible for the Hanle effect. The proposed numerical method of solution is based on a Polarized Approximate Lambda Iteration (PALI) method. A Fourier decomposition of the radiation field and of the phase matrix with respect to the azimuthal angle reduces the complexity of the problem. A generalized core-wing technique is proposed, which permits an efficient implementation of the frequency domain structure inherent in the polarized redistribution matrix. The numerical method is tested for its accuracy and efficiency by comparing with the existing methods.

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