Letter | Published:

Thickness and Height of the Sodium Layer Responsible for the Strong Yellow Line in Twilight

Nature volume 162, page 300 (21 August 1948) | Download Citation



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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  1. 1.

    , Nature, 145, 588 (1940).

  2. 2.

    , and , Geof. Pub. Oslo, 13, No. 1 (1940).

  3. 3.

    , and , Geof. Pub. Oslo, 16, No. 7 (1945).

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  1. Physical Institute, University, Oslo. April 19.

    • L. VEGARD


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