An Analytic Geometry-Variant Approach to Line Ratio Enhancement above the Optically Thin Limit

We describe a simple theoretical model to investigate the anomalous effects of opacity on spectral line ratios, as previously studied in elements such as Fe XV and Fe XVII. The model developed is general: it is not specific to a particular atomic system, thus giving applicability to a number of coro...

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Published inThe Astrophysical journal Vol. 629; no. 2; pp. 1091 - 1101
Main Authors Kerr, F. M, Rose, S. J, Wark, J. S, Keenan, F. P
Format Journal Article
LanguageEnglish
Published Chicago, IL IOP Publishing 20.08.2005
University of Chicago Press
Subjects
Ultraviolet radiation
X-rays: general
Analytical method
methods: analytical
Radiative transfer
stars; coronae - Sun: UV radiation
Sun
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Summary:We describe a simple theoretical model to investigate the anomalous effects of opacity on spectral line ratios, as previously studied in elements such as Fe XV and Fe XVII. The model developed is general: it is not specific to a particular atomic system, thus giving applicability to a number of coronal and chromospheric plasmas; furthermore, it may be applied to a variety of astrophysically relevant geometries. The analysis is underpinned by geometrical arguments, and we outline a technique for it to be used as a tool for the explicit diagnosis of plasma geometry in distant astrophysical objects.
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ISSN:0004-637X
1538-4357
DOI:10.1086/429881