Origin of the Yellow Line in Twilight and the Night Sky Luminescence

Physics

Scientific paper

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Scientific paper

THE appearance in the night sky spectrum of a yellow line was observed in 1929 by Slipher1, who measured a wave-length 5892, by Dufay2, Sommer3, Cabannes4 and by Vegard and Tonsberg5. The latter gave the wave-length 5892.6, and finding the line considerably broader than a single atomic line, they concluded that it had a fine structure. Twilight spectra giving the yellow line were obtained by Vegard at Oslo on January 13, 1936, and Tromsö in February of the same year6.

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