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Title: Partial redistribution effects on polarized lines formed in movingmMedia in the presence of a weak magnetic field
Authors: Sampoorna, M
Nagendra, K. N
Keywords: Polarization;Radiative transfer;Scattering;Stars: atmospheres;Sun: chromosphere
Issue Date: Oct-2015
Publisher: Cambridge University Press
Citation: Proceedings of the International Astronomical Union, Vol. 305, pp. 387-394
Series/Report no.: International Astronomical Union Symposium; 305
Abstract: Macroscopic velocity fields in stellar atmospheres significantly affect the shapes of the emergent Stokes profiles. The inextricable coupling between the angle and frequency variables becomes more complex in a moving medium when compared to a static medium. In this paper we consider both complete frequency redistribution (CRD) and partial frequency redistribution (PRD) in the line scattering of a two-level atom in the presence of an external weak magnetic field. For simplicity we consider empirical velocity laws to represent motion of the atmospheric layers. We present emergent Stokes profiles computed with CRD, angle-averaged PRD, and angle-dependent PRD. We show that angle-dependent PRD effects are important both in non-magnetic and magnetized scattering when vertical velocity gradients are present in the atmosphere. The results are presented for simple atmospheric models. They are expected to be of relevance to polarized line formation in slowly expanding chromospheric layers.
Description: Restricted Access
ISSN: 1743-9213
???metadata.dc.rights???: © International Astronomical Union
Appears in Collections:IIAP Publications

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