scholarly journals Study of resonance scattering polarization in O i 130 nm lines

2014 ◽  
Vol 10 (S305) ◽  
pp. 234-237
Author(s):  
L. S. Anusha ◽  
K. N. Nagendra ◽  
Han Uitenbroek
Keyword(s):  
Radiative Transfer ◽  
Resonance Scattering ◽  
Two Dimensional ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution

AbstractHere we address the importance of frequency cross-redistribution on the scattering polarization of the O i line at 130.2 nm. We compute the polarized profiles of this line with ordinary partial frequency redistribution and cross-redistribution using a two-dimensional radiative transfer code.

scholarly journals On the importance of partial frequency redistribution in modeling the scattering polarization

2014 ◽  
Vol 10 (S305) ◽  
pp. 351-359
Author(s):  
K. N. Nagendra
Keyword(s):  
Quantum Interference ◽  
Solar Spectrum ◽  
Resonance Scattering ◽  
Spectral Lines ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Physical Mechanisms ◽  
Partial Frequency Redistribution ◽  
Scattering Matrices ◽  
Line Transfer

AbstractIt is well-known that partial frequency redistribution (PRD) is the basic physical mechanism to correctly describe radiative transfer in spectral lines. In the case of polarized line scattering, the PRD becomes particularly important to describe the line-wing polarization, instead of the well-known mechanism of complete redistribution (CRD). Historically, the two-level atom PRD scattering matrices for polarized line scattering were first derived in the 1970's, and later generalized to the case of arbitrary fields in 1997. The latter formulation of the PRD matrices have subsequently been used in the solution of the line transfer equation to successfully model the non-magnetic (resonance scattering) and the magnetic (Hanle scattering) polarization observations. In recent years, using the Kramers-Heisenberg approach, we formulated PRD matrices for various physical mechanisms like quantum interference involving fine- and hyperfine-structure states in a two-term atom. The effect of collisions is included in an approximate way. We have used these PRD matrices to model the observed linear polarization in several interesting lines of the Second Solar Spectrum. In this paper I present a few results which highlight the importance of PRD in the interpretation of the polarized Stokes profiles.

scholarly journals On the Strength of the CIV 155 nm Resonance Lines in Planetary Nebulae

1983 ◽  
Vol 103 ◽  
pp. 518-518 ◽  
Author(s):  
J. Köppen ◽  
R. Wehrse
Keyword(s):  
Radiative Transfer ◽  
Resonance Line ◽  
Spectroscopic Data ◽  
Planetary Nebulae ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Upper Level ◽  
Dust Absorption

Ionization models for NGC 6210, 7009, 3242 and II 2003 have been constructed from optical and IUE spectroscopic data. The CIV 155 nm resonance line is predicted about ten times stronger than observed. Radiative transfer calculations of the CIV lines in a spherical nebula, assuming partial frequency redistribution, were made to investigate the effects of dust absorption and an additional depopulation of the upper level.

scholarly journals 2-D Radiative Transfer Simulations with Angle-Dependent Partial Frequency Redistribution

1998 ◽  
Vol 167 ◽  
pp. 209-212
Author(s):  
A.B. Gorshkov ◽  
P. Heinzel
Keyword(s):  
Radiative Transfer ◽  
Numerical Simulations ◽  
Line Profiles ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Solar Prominences ◽  
Transfer Modelling ◽  
Redistribution Function

AbstractWe demonstrate how the angle-dependent redistribution function can be incorporated into the 2-D transfer modelling of solar prominences. Some preliminary numerical simulations have been performed and we present their results by comparing the emergent hydrogen Lα line profiles computed with the angle-averaged and angle-dependent redistributions.

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