Abstract
IN the spectrum of the sky at twilight, a yellow radiation was found very near the mean wave-length of the sodium D lines (λ = 5893 A.). This radiation is relatively strong, but its intensity decreases abruptly in one or two minutes (Fig. 1), as if it was first excited, or rather considerably enhanced, under the action of the sunlight. Observations made at the Tromsø Observatory, in the autumn of 1937, have shown that the excitation occurs in a layer at the altitude of about 60 km.
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BERNARD, R. Sodium in the High Atmosphere. Nature 141, 788 (1938). https://doi.org/10.1038/141788a0
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DOI: https://doi.org/10.1038/141788a0
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