Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..563k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 1, 1989, p. 563-566. Research supported by SERC.
Astronomy and Astrophysics
Astrophysics
11
Argon, Line Spectra, Solar Flares, Solar Spectra, Stellar Composition, Atomic Energy Levels, Satellite-Borne Instruments, Skylab Program, Solar Spectrometers, Spectrum Analysis
Scientific paper
Theoretical Ar XV emission-line ratios are presented for R1 = I(2s2p 1P-2s2 1S)/I(2s2p 3P1-2s2 1S) = I(221.12 A)/I(423.98 A) and R2 = I(2s2p 1P-2s2 1S)/I(2p2 3P2-2s2p 3P2) = I(221.12 A)/I(266.23 A), which are electron temperature and density sensitive, respectively. A comparison of these with observational data for solar flares obtained with the NRL S082A slitless spectrograph on board Skylab reveals that there is good agreement between theory and observation for R1, which provides experimental support for the accuracy of the atomic data adopted in the analysis. However the observed values of R2 all lie below the theoretical high-density limit, which may be due to blending of the 266.23 A transition with an unidentified line.
Keenan Francis P.
McCann S. M.
Widing Kenneth G.
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