dc.contributor.author |
Anusha, L. S |
|
dc.contributor.author |
Nagendra, K. N |
|
dc.date.accessioned |
2012-02-01T10:51:04Z |
|
dc.date.available |
2012-02-01T10:51:04Z |
|
dc.date.issued |
2012-02-10 |
|
dc.identifier.citation |
The Astrophysical Journal, Vol. 746, No. 1 , 84 |
en |
dc.identifier.uri |
http://hdl.handle.net/2248/5685 |
|
dc.description |
Open Access |
en |
dc.description.abstract |
The solution of polarized radiative transfer equation with angle-dependent (AD) partial frequency redistribution (PRD) is a challenging problem. Modeling the observed, linearly polarized strong resonance lines in the solar spectrum often requires the solution of the AD line transfer problems in one-dimensional or multi-dimensional (multi-D) geometries. The purpose of this paper is to develop an understanding of the relative importance of the AD PRD effects and the multi-D transfer effects and particularly their combined influence on the line polarization. This would help in a quantitative analysis of the second solar spectrum (the linearly polarized spectrum of the Sun). We consider both non-magnetic and magnetic media. In this paper we reduce the Stokes vector transfer equation to a simpler form using a Fourier decomposition technique for multi-D media. A fast numerical method is also devised to solve the concerned multi-D transfer problem. The numerical results are presented for a two-dimensional medium with a moderate optical thickness (effectively thin) and are computed for a collisionless frequency redistribution. We show that the AD PRD effects are significant and cannot be ignored in a quantitative fine analysis of the line polarization. These effects are accentuated by the finite dimensionality of the medium (multi-D transfer). The presence of magnetic fields (Hanle effect) modifies the impact of these two effects to a considerable extent. |
en |
dc.language.iso |
en |
en |
dc.publisher |
IOP Publishing |
en |
dc.relation.uri |
http://dx.doi.org/10.1088/0004-637X/746/1/84 |
en |
dc.rights |
© IOP Publishing |
en |
dc.subject |
Line: formation |
en |
dc.subject |
Magnetic fields |
en |
dc.subject |
Polarization |
en |
dc.subject |
Radiative transfer |
en |
dc.subject |
Scattering |
en |
dc.subject |
Sun: atmosphere |
en |
dc.title |
Polarized Line Formation in Multi-dimensional Media. V. Effects of Angle-dependent Partial Frequency Redistribution |
en |
dc.type |
Article |
en |