Jun 1926
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1926natur.117..791c&link_type=abstract
Nature, Volume 117, Issue 2953, pp. 791 (1926).
Other
1
Scientific paper
ON Sunday, May 16, at 16.25 I noticed a double halo round the sun. There was much cumulus and fracto-cumulus at the time, but this cleared off later, and at about 17.30 the sky was clear except for some clouds near the horizon; at this time both halos were well seen, each extending to well over a semicircle. Except for the cumulus near the horizon the sky seemed at first sight to be absolutely blue and cloudless, but by looking carefully in the neighbourhood of the halos very faint strands of cirro stratus were seen. Both halos had a tinge of red on the side nearest the sun, but otherwise were white; they were equal in brightness except for a short time when the inner halo brightened on the right-hand side of the sun for some 30° or so, the colour at the same time becoming rather more marked. Before sunset both halos faded, the inner one disappearing first. The radius of the inner halo to the middle of the band was from 18° 30' to 18° 40' as measured with a sextant. Better measurements, perhaps, were obtained from a photograph taken on a panchromatic plate through a Wratten A (deep red) filter; this gave the radii for the inner halo of 17½° to the inner edge and 21° to the outer edge, for the outer halo 22½° and 26½° respectively. The photograph was taken with a wide angle lens, and allowance was made for distortion away from the centre of the plate in making the above measurements.
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