Abstract
MEASUREMENTS of the height of the base of the aurora in northern Norway by C. Störmer (Geofys. Publ., I., No. 5) and by L. Vegard and O. Krogness (Geofys. Publ., I., No. 1) show that a considerable number of the bases are situated at heights of about 100 km. and about 106 km. (compare the frequency curve, Fig. 18, Geofys. Publ., I., No. 1, p. 101). In treating 1737 base-heights between 90 and 120 km. it was found from the frequency curve that during ebb-tide in the atmosphere the maximum at 100 km. was predominant, while during flood-tide the maximum at 106 km. was predominant. Further investigations have shown that the maxima of the frequency curve are to be considered as displacements of one and the same maximum. From this we conclude that, as regards the locality considered, the mass of air situated above 100 km. at ebb-tide is the same as the mass of air situated above 106 km. at flood-tide.
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EGEDAL, J. Variation of Conductivity of the Upper Atmosphere. Nature 123, 642–643 (1929). https://doi.org/10.1038/123642b0
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DOI: https://doi.org/10.1038/123642b0
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