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Polarized Line Formation in Non-Monotonic Velocity Fields

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dc.contributor.author Sampoorna, M
dc.contributor.author Nagendra, K. N
dc.date.accessioned 2020-11-17T14:44:49Z
dc.date.available 2020-11-17T14:44:49Z
dc.date.issued 2016-12-10
dc.identifier.citation The Astrophysical Journal, Vol. 833, No. 1, 32 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7196
dc.description Restricted Access © The American Astronomical Society http://dx.doi.org/10.3847/1538-4357/833/1/32 en_US
dc.description.abstract For a correct interpretation of the observed spectro-polarimetric data from astrophysical objects such as the Sun, it is necessary to solve the polarized line transfer problems taking into account a realistic temperature structure, the dynamical state of the atmosphere, a realistic scattering mechanism (namely, the partial frequency redistribution—PRD), and the magnetic fields. In a recent paper, we studied the effects of monotonic vertical velocity fields on linearly polarized line profiles formed in isothermal atmospheres with and without magnetic fields. However, in general the velocity fields that prevail in dynamical atmospheres of astrophysical objects are non-monotonic. Stellar atmospheres with shocks, multi-component supernova atmospheres, and various kinds of wave motions in solar and stellar atmospheres are examples of non-monotonic velocity fields. Here we present studies on the effect of non-relativistic non-monotonic vertical velocity fields on the linearly polarized line profiles formed in semi-empirical atmospheres. We consider a two-level atom model and PRD scattering mechanism. We solve the polarized transfer equation in the comoving frame (CMF) of the fluid using a polarized accelerated lambda iteration method that has been appropriately modified for the problem at hand. We present numerical tests to validate the CMF method and also discuss the accuracy and numerical instabilities associated with it. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Line: profiles en_US
dc.subject Polarization en_US
dc.subject Radiative transfer en_US
dc.subject Scattering en_US
dc.subject Stars: atmospheres en_US
dc.subject Sun: chromosphere en_US
dc.title Polarized Line Formation in Non-Monotonic Velocity Fields en_US
dc.type Article en_US

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