Non-coherent scattering in subordinate line-V. Solutions of the transfer problem

I. Hubený, P. Heinzel

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We present several examples of the numerical solution of the radiative transfer in subordinate lines. Using a simplified physical model that yields the line source function analogous to the usual two-level-atom form modified by the presence of the redistribution function Rv in the scattering integral, we have solved the transfer problem for isothermal, plane-parallel atmospheres, both finite and semi-infinite. For finite atmospheres, we have found substantial differences between the solutions with Rv and those with complete redistribution. On the other hand, for semi-infinite atmospheres the complete redistribution appears to be a good approximation, at least for al{reversed tilde equals}au (damping parameters for the lower and upper levels, respectively). It is shown that the effect of Rv becomes more pronounced with increasing ratio au/al. Finally, it is demonstrated that an approximate form for Rv analogous to that of Kneer for RII serves as a very good approximation for computing the line profiles, particularly in the line wings.

Original languageEnglish (US)
Pages (from-to)159-168
Number of pages10
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume32
Issue number2
DOIs
StatePublished - Aug 1984

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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