Abstract
A GROUP of intense unidentified lines in the solar spectrum in the range 170–220 Å was first recognized in a laboratory source by Fawcett et al.1, who compared solar spectra photographed by Tousey2 with spectra from Zeta, and indicated that iron was the probable source element. There followed work from a number of laboratories3–5, all confirming that iron was the element responsible. More recently, Gabriel, Fawcett and Jordan6 have obtained classifications for many of the lines in this group, which is due chiefly to FeIX to FeXIV. This work also provided information on the corresponding isoelectronic sequences through to nickel.
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References
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GABRIEL, A., FAWCETT, B. Identification of the Solar Spectrum in the Region 60–170 Å. Nature 206, 808–809 (1965). https://doi.org/10.1038/206808a0
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DOI: https://doi.org/10.1038/206808a0
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