Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135..353k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 135, Oct. 1991, p. 353-360. Research supported by DOE and Department of Education for North
Physics
4
Emission Spectra, Extreme Ultraviolet Radiation, Line Spectra, Solar Activity, Solar Spectra, Spectral Energy Distribution, Electron Transitions, Iron, Metallicity, Spectrometers
Scientific paper
Theoretical electron-density-sensitive Fe XII emission-line ratios are derived using R-matrix electron impact excitation rate calculations. Two Fe XII transitions are identified in an active region spectrum obtained with the Harvard S-055 spectrometer on board Skylab at wavelengths of 364.0, 382.8, 1241.7, and 1349.4 A, respectively. Electron densities are significantly larger than the typical active region measurements, but are similar to those derived from some active region spectra observed with the Skylab 2082A instrument, which provides observational support for the atomic data adopted in the line-ratio calculations, and also for the identification of the Fe XII transitions in the S-055 spectrum. However, the observed value of R3 = I(1349.4 A)/I(1241.7 A) is approximately a factor of two larger than expected from theory which, considering that the 1349.4 A line lies at the edge of the S-055 wavelength coverage, may reflect errors in the instrument-efficiency curve. Another possibility is that the 1349.4 A transition is blended, probably with Si II 1350.1 A.
Doyle Gerry J.
Henry Ronald J. W.
Keenan Francis P.
Tayal Swaraj S.
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