Abstract
LUMINOUS night clouds were observed in the northern sky in Scotland on the nights of July 9–10 and July 10–11, the extensive display showing characteristic wave structure in the early morning of July 11 being quite magnificent. Brilliantly blue-white in colour, the night clouds appeared about half an hour after sunset in a sky almost clear of normal cloud, were most brilliant during the hour after midnight and faded in the growing light before sunrise. A series of simultaneous photographs (one pair is reproduced here) by Störmer–Krogness auroral cameras from Abernethy and Blairgowrie will yield measurements of height, direction and speed of movement, as also of distance between successive wave-crests.
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References
Jesse, Ast. Nachr., 140 (1896).
Störmer, Ast. Norv., 1, No. 3 (1935); Nature, 134, 219 (1934); 135, 103 (1935).
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PATON, J. Luminous Night Clouds. Nature 164, 192 (1949). https://doi.org/10.1038/164192a0
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DOI: https://doi.org/10.1038/164192a0
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