Other
Scientific paper
Dec 1909
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1909natur..82r.157b&link_type=abstract
Nature, Volume 82, Issue 2093, pp. 157 (1909).
Other
Scientific paper
ON the evening of Friday, December 3, there occurred a very brilliant display of luminous night clouds in rather peculiar circumstances. During the earlier part of the evening the sky had been clear, and no indications of an aurora were observed. About 10.15 p.m. the sky became completely overcast quite suddenly, and it was noticed that this appeared to be by general formation of haze in situ, and not by the drifting of clouds. Almost immediately after this numerous patches of light cloud appeared, travelling with considerable velocity eastward. From numerous previous experiences it was at once apparent that these were not ordinary cloud forms, and the moon was not high enough to account for their extreme brilliancy. Careful examination with a hand spectroscope confirmed the surmise that they were luminous clouds, the green auroral line being very bright and sharply defined; on several of the brighter masses other lines were suspected, but not sufficiently well to assign any position. These observations were confirmed by Mr. W. Moss. At about 10.45 p.m. the clouds gradually became less frequent, and the sky became clear again almost as suddenly as it had been overcast.
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