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| Paper: |
Effects of Lower-Level Polarization and Partial Frequency Redistribution
on Stokes Profiles |
| Volume: |
526, Solar Polarization Workshop 8 |
| Page: |
61 |
| Authors: |
Supriya, H. D.; Nagendra, K. N.; Sampoorna, M.; Stenflo, J. O.; Ravindra, B. |
| Abstract: |
The theory of polarized radiative transfer including the effects of partial frequency
redistribution (PRD) for a two-level and two-term atom has been formulated in the scattering matrix
approach. However there exist several enigmatic features in the Second
Solar Spectrum which cannot be explained on the basis of said approach. The reason for this
lies in the approximations made in this approach.
One such approximation is the assumption that the lower level of the
atom involved in the scattering process is unpolarized. There are alternative approaches based on the
density matrix formalism to relax this assumption. It has been shown that the inclusion of the polarization
of all the atomic levels involved in the scattering process is important. In our recent studies,
the collisionless redistribution matrix
including the effects of both PRD and lower-level polarization (LLP) was derived starting from the
Kramers-Heisenberg scattering formulation. We proposed a simple numerical
technique namely, the correction method, to solve the problem of polarized radiative transfer with PRD and LLP.
Here we apply this technique to different atomic systems and discuss the effects of PRD and LLP on the emergent Stokes
profiles. |
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