May 1923
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1923natur.111..706h&link_type=abstract
Nature, Volume 111, Issue 2795, pp. 706 (1923).
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Scientific paper
MAGNETIC disturbances and associated phenomena have perhaps a special interest when they occur during the minimum period of sunspot activity, owing to the comparative rarity of these events at this time. When, therefore, I read in NATURE of April 21, p. 534, the account by Father Cortie of the recent disturbances, it reminded me of observations I had made of the aurora in activity on the dates referred to. On February 25, in a very clear sky, with a nine-days-old moon shining, the northern horizon was seen to be brightly illuminated by auroral light at 8.45 P.M. for about half an hour, but no streamers were seen. On March 24, again in first-quarter moonlight, but a very hazy sky, I saw an auroral display of unusual beauty at 9 P.M. over Bassenthwaite Lake. The arch was elevated ten degrees, with streamers and lances shooting upwards for, in some cases, another thirty degrees. The length of the arch I could not measure, owing to each end being hidden by lofty mountains, but it was visible for sixty degrees. It was clear-cut below, and merged gradually into the moonlit haze above.
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