Abstract
FROM the appearance of very long auroral rays in the middle of the night, as described for the auroral display at Oslo of October 16 [see NATURE, Nov. 28, p. 930], it follows that the density of matter also during the night may decrease very slowly upwards.
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L. Vegard, ” Die Korona der Erde und Sonne, etc.”, Gerlands Beiträge zur Geophys., 32, 288 (1931).
Cf. L. V. Berkner and H. W. Wells, ” Report on Ionospheric Observations during Solar Eclipse of June 19, 1936”. Presented to the Edinburgh Congress of the International Union of Geodesy and Geophysics.
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VEGARD, L. Auroral Phenomena and the Behaviour of the Ionosphere during a Total Solar Eclipse. Nature 138, 974 (1936). https://doi.org/10.1038/138974a0
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DOI: https://doi.org/10.1038/138974a0
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