Physics
Scientific paper
Jul 1908
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1908natur..78..247c&link_type=abstract
Nature, Volume 78, Issue 2020, pp. 247 (1908).
Physics
1
Scientific paper
ON July 2, one of the days on which Miss Stevens saw a halo at Oxford (NATURE, July 9, p. 221), a very bright halo was visible in the neighbourhood of Torbay. I first noticed it about 9 a.m., and it remained visible well into the afternoon. It attained its greatest brightness from 11 a.m. until noon. On looking at it through dark glasses it exhibited a somewhat remarkable form; the main halo had the usual radius of about 22°, but east and west were arcs of which the greatest distance from the sun was about 25° these arcs gradually ran into the 22° halo. The effect was somewhat as though an elliptical halo were superposed on a circular one, the parts where the two coincided being of enhanced brightness. Below the sun there were at times fragments of halo at 44°. Masses of cirrus drifting from an easterly direction passed across the halo at times and partially obscured it, but probably had no part in its, formation; it could be seen shining through the thinner parts of these clouds, and it regained its brightness as soon as they passed over. The halo was evidently formed by thin clouds above the ordinary cirrus, but no definite structure was visible to enable one to determine which way this layer was moving.
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