Abstract
IN a communication in Nature1 in 1940 I gave a short account of results of investigations on "The Atmospheric Layer from which the Yellow Line in Twilight Originates". From a series of spectrograms from the zenith followed by one from near the horizon, the effective screening height (Hs) of the atmosphere and the upper limit (Hu) of the effective sodium layer were determined. Since then, the results of extensive series of observations from Oslo and from the auroral observatory at Trömso have been published2,3.
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References
Vegard, L., Nature, 145, 588 (1940).
Vegard, L., and Tønsberg, E., Geof. Pub. Oslo, 13, No. 1 (1940).
Vegard, L., and Kvifte, G., Geof. Pub. Oslo, 16, No. 7 (1945).
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VEGARD, L. Thickness and Height of the Sodium Layer Responsible for the Strong Yellow Line in Twilight. Nature 162, 300 (1948). https://doi.org/10.1038/162300a0
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DOI: https://doi.org/10.1038/162300a0
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