Abstract
IN a previous note in NATURE1, I described observations made at Oslo of an auroral display which showed red upper limits, while the lower part had the ordinary greenish-yellow colour. Spectroscopic observations gave an enormous enhancement of the red oxygen line 6300 with increasing height. In a later paper2, I described quantitative measurements of spectrograms corresponding to auroras of ordinary colour, which also gave a considerable enhancement of the red line 6300 with increasing altitude. It became a matter of importance to make further measurements in order to see if the altitude effect on the red line was a general occurrence.
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References
Vegard, L., NATURE, 138, 930 (1936).
Vegard, L., Z. Phys., 106, 108 (1937).
Vegard and Tönsberg, NATURE, 137, 778 (1936).
Vegard, L., Geophys. Pub., 10, No. 4 (1933).
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VEGARD, L. Altitude Effects in the Red Part of the Auroral Spectrum and the Two Types of Red Auroras. Nature 141, 200 (1938). https://doi.org/10.1038/141200a0
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DOI: https://doi.org/10.1038/141200a0
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