An analytic geometry-variant approach to line ratio enhancement above the optically thin limit

Francis Keenan, F.M. Kerr, S.J. Rose, J.S. Wark

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)1091-1101
Number of pages11
JournalAstrophysical Journal
Volume629
Issue number2 I
Publication statusPublished - 20 Aug 2005

ASJC Scopus subject areas

  • Space and Planetary Science

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