|Polarized Line Formation: Methods and Solutions
|526, Solar Polarization Workshop 8
|Nagendra, K. N.
|In this paper I briefly review few methods that we have developed over the past
several years for solving polarized line transfer problems of varying
degrees of complexity. I describe the way in which the complexity of
the transfer problem increases as one introduces the physics of partial
frequency redistribution (PRD), magnetic field, multi-level coupling, the
velocity fields, and finally multi-D effects in the line forming region.
Examples are given to demonstrate how the methods are applied after
suitable modifications. The methods are qualitatively compared in
terms of their numerical performance. Some sample results are shown to
demonstrate the usefulness of these methods in theoretical modeling of
the solar polarimetric data. The results discussed are Hanle effect,
the J and F state quantum interference effects, the effects of
angle-dependent PRD, the effects of
macroscopic velocity fields on the spectral lines formed in the
solar atmosphere, and finally transfer effects in multi-D geometry.