Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6852
Title: Polarized line formation in moving atmospheres with partial frequency redistribution and a weak magnetic field
Authors: Sampoorna, M
Nagendra, K. N
Keywords: Line: profiles;Polarization;Radiative transfer;Scattering;Stars: atmospheres;Sun: chromosphere
Issue Date: 10-Oct-2015
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 812, No. 1, 28
Abstract: The dynamical state of the solar and stellar atmospheres depends on the macroscopic velocity fields prevailing within them. The presence of such velocity fields in the line formation regions strongly affects the polarized radiation field emerging from these atmospheres. Thus it becomes necessary to solve the radiative transfer equation for polarized lines in moving atmospheres. Solutions based on the "observer's frame method" are computationally expensive to obtain, especially when partial frequency redistribution (PRD) in line scattering and large-amplitude velocity fields are taken into account. In this paper we present an efficient alternative method of solution, namely, the comoving frame technique, to solve the polarized PRD line formation problems in the presence of velocity fields. We consider one-dimensional planar isothermal atmospheres with vertical velocity fields. We present a study of the effect of velocity fields on the emergent linear polarization profiles formed in optically thick moving atmospheres. We show that the comoving frame method is far superior when compared to the observer's frame method in terms of the computational speed and memory requirements.
Description: Restricted Access
URI: http://hdl.handle.net/2248/6852
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: http://dx.doi.org/10.1088/0004-637X/812/1/28
Appears in Collections:IIAP Publications



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