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Title:
Fe XIV line ratios in the sun
Authors:
Keenan, F. P.; Dufton, P. L.; Boylan, M. B.; Kingston, A. E.; Widing, K. G.
Affiliation:
AA(Belfast, Queen's University, Northern Ireland), AB(Belfast, Queen's University, Northern Ireland), AC(Belfast, Queen's University, Northern Ireland), AD(Belfast, Queen's University, Northern Ireland), AE(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 695-698. (ApJ Homepage)
Publication Date:
06/1991
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Line Spectra, Metallicity, Solar Flares, Solar Spectra, Ultraviolet Spectra, Atomic Spectra, Emission Spectra, Iron, Planetary Nebulae
DOI:
10.1086/170090
Bibliographic Code:
1991ApJ...373..695K

Abstract

Recent R-matrix calculations of electron-impact excitation rates for Fe XIV are used to derive theoretical electron density-sensitive emission-line ratios involving transitions in the wavelength range 211-274 A. Electron densities deduced from the observed line ratios for solar flares and active regions, obtained with the Naval Research Laboratory's SO82A slitless spectrograph on board Skylab, are in excellent internal agreement and, furthermore, compare favorably with densities determined independently from line ratios in Fe XII and Fe XIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as well as for the techniques used to calculate the line ratios.

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