Abstract
IN the winter of 1930–31, I was measuring the height of the aurora in northern Ontario. On one occasion there had been a well-developed single arc which had remained unusually steady throughout the evening, and I was surprised to see at dawn next morning a light band of cloud stretched in a perfect bow from horizon to horizon, and in what seemed to be the exact position that the aurora had occupied. The cloud was of a yellowish, smoky appearance, and quite unlike the cirrus formation present in other parts of the sky. It faded away about sunrise.
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WYNNE-EDWARDS, H. Types of Iridescent Clouds. Nature 129, 798 (1932). https://doi.org/10.1038/129798a0
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DOI: https://doi.org/10.1038/129798a0
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