Abstract
REFERRING to Dr. Marie Stopes's observation of a halo about the eclipsed sun on April 17, Mr. Patrick Hepburn writes that Mrs. Hepburn, observing from near the central line in France, noticed what seemed to be rather of the nature of a corona than a halo, although they concluded that it had no connection with the true solar corona; it was coloured, with the violet outwards. Mr. C. O. Bartrum also discusses this phenomenon, and from two friends, one of whom saw the eclipse from near Paris, the other from Highgate, he gathers that “the appearance of a circle round the sun” seems to have been a corona due to diffraction, the colours appearing purer and brighter than usual because of the reduction in the effective size of the sun.
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The Eclipse of the Sun, April 17 . Nature 89, 251 (1912). https://doi.org/10.1038/089251a0
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DOI: https://doi.org/10.1038/089251a0