Über das Auftreten der Natrium-D-Linien im Nachthimmelleuchten und im Nordlicht

Cario, Günther GND; Stille, Ulrich GND

In the course of investigations of the twilight-effect of the D-lines of sodium 14 spectra were photographed on March 1, 1941, showing the strong aurora on this evening. The spectra prove unambiguously that the twilight-effect occures completely undisturbed and independent of the aurora observed at the same time; i.e. the layers normally emitting the D-lines in the night-sky are not affected by the aurora. The auroral spectrum does not contain the D-lines. Thus the aurora took place above the layer emitting the D-lines in the night-sky. Occasional observations of the D-lines in auroras of higher layers indicate that in such cases the sodium was of extraterrestrial origin.

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Cario, Günther / Stille, Ulrich: Über das Auftreten der Natrium-D-Linien im Nachthimmelleuchten und im Nordlicht. Braunschweig 1954. Vieweg.

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