|Comoving Frame Method for Polarized PRD Line Transfer with Velocity Fields
|526, Solar Polarization Workshop 8
|Sampoorna, M.; Nagendra, K. N.
|The solution of the transfer equation in moving atmospheres is a classical
problem. While the low-velocity regime can be handled in a simpler
manner using the observer's frame method, the regime of high-velocity
requires the comoving frame technique to be applied. We show that even
in the low-velocity regime (like that prevailing in the solar
atmosphere) we require the comoving frame method when linear
polarization together with partial frequency redistribution (PRD)
in line scattering is considered. This situation arises because of
the numerical difficulties that we encounter in the observer's frame
method, namely, a heavy demand on the angle, frequency,
and depth grids when we consider polarized line formation with PRD
and velocity fields. These difficulties can be
overcome by applying the comoving frame technique.
Here we present the details of this
technique and its applications to solar-like conditions.