Red and Sunlit Auroras and the State of the Upper Atmosphere


ON October 16 this year, a strong auroral display was observed at Oslo. It commenced as an arc fairly low on the northern sky, but at intervals it took the form of a drapery-shaped band with pronounced ray structure, and sometimes—for example, between 22h and 23h in the evening—rays of quite unusual length (several hundred kilometres) were observed.

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    Cf. L. Vegard and E. Tönsberg, NATURE, 137, 778 (1936).

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VEGARD, L. Red and Sunlit Auroras and the State of the Upper Atmosphere. Nature 138, 930–931 (1936).

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