Abstract
A study of theZ-dependence of the2 P intervals of 2s 22p and 2s 22p 5, aided by recent observational results, confirms the identification in the coronal spectrum of λ 4412 with Arxiv, and of λ 5533.4 with Arx. It is further shown that transitions from metastable levels in the configurations 3s 23p k 3d, withk=3, 4 and 5, of Fexi,x, ix, and Nixiii, xiii, xi can well account for the remaining unidentified coronal lines.
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Edlén, B. On the identification of Ar x and Ar xiv in the solar corona and the origin of the unidentified coronal lines. Sol Phys 9, 439–445 (1969). https://doi.org/10.1007/BF02391668
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DOI: https://doi.org/10.1007/BF02391668