Abstract
IN looking over my spectrum plates of oxygen I find some which show not only the nebular lines λ6300 and λ6364,1 which had not been produced in the laboratory before, but also a strong line λ6374.29. The wave-length of this line seems to be identical with that of the strong, red coronal line λ6374.2.2 Although this oxygen line is well known, I do not think that the above remarkable coincidence has been previously pointed out. This coincidence in the wave-lengths of the oxygen and the coronal line, and also the fact that the line occurs in an isolated position in the oxygen spectrum when only lines of O I were present, would seem to indicate their identity, and is strong evidence of the presence of oxygen in the sun's corona.
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References
Paschen : Die Naturwissenschaften, 34, 752; 1930.
Campbell and Moore : Publications of the Lick Observatory, Bulletin 318, 8; 1918.
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HOPFIELD, J. The Red Coronal Line in Oxygen. Nature 126, 846 (1930). https://doi.org/10.1038/126846a0
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DOI: https://doi.org/10.1038/126846a0
