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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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