On the Sensitivity of Partial Redistribution Scattering Polarization Profiles to Various Atmospheric Parameters

Details On the Sensitivity of Partial Redistribution Scattering Polarization Profiles to Various Atmospheric Parameters On the Sensitivity of Partial Redistribution Scattering Polarization Profiles to Various Atmospheric Parameters

2010-08-16

arxiv.org/abs/1008.2585v1

The Astrophysical Journal 722 (2010) 1269-1289

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

45 pages, 16 figures, accepted for publication in the Astrophysical Journal (2010)

Scientific paper

10.1088/0004-637X/722/2/1269

This paper presents a detailed study of the scattering polarization profiles formed under partial frequency redistribution (PRD) in two thermal models of the solar atmosphere. Particular attention is given to understanding the influence of several atmospheric parameters on the emergent fractional linear polarization profiles. The shapes of these $Q/I$ profiles are interpreted in terms of the anisotropy of the radiation field, which in turn depends on the source function gradient that sets the angular variation of the specific intensity. We define a suitable frequency integrated anisotropy factor for PRD that can be directly related to the emergent linear polarization. We show that complete frequency redistribution is a good approximation to model weak resonance lines. We also show that the emergent linear polarization profiles can be very sensitive to the thermal structure of the solar atmosphere and, in particular, to spatial variations of the damping parameter.

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