Abstract
IN 1942, Edlén1 identified twenty-three emission lines in the solar corona. One of the two doubtful identifications in the list, that of the yellow line λ 5694 with the transition 2p 2 3P1→0 in Ca XV, presents an especially interesting problem, because the ionization energy of Ca XV (814 eV.) exceeds that of every ion known to produce coronal lines. If Edlén's identification were to prove correct, it would provide an important clue to the mystery of coronal excitation.
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References
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Pecker, Charlotte, Billings, D., and Roberts, W. O., C.R. Acad. Sci., Paris, 238, 1101 (1954).
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LAYZER, D. The Yellow Emission Line of the Solar Corona. Nature 175, 647–648 (1955). https://doi.org/10.1038/175647a0
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DOI: https://doi.org/10.1038/175647a0
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