A Halo Phenomenon


AT 10.15 a.m. G.M.T. on May 2 last some cirrus clouds drifted across the sun; I suspect that they were the remains of condensation trails. As they passed over, I noticed a very peculiar halo phenomenon. The part first visible was the arc M' X'; I did not suspect that it was part of a halo circle, though it struck me that it was very like one; I took it to be a long wisp of cirrus or part of a condensation trail. But there then appeared at M' a very brightly coloured parhelion, and at the same time I noticed part of a 22° halo at A,B. A few minutes later the are X' M' had extended through the sun (S) to M and X; there was another brightly coloured parhelion at M; I think that M and M' were rather more than 22° from the sun. The whole phenomenon lasted a very few minutes; I went indoors to get a camera, but by the time I came out again it was all over.

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CAVE, C. A Halo Phenomenon. Nature 154, 240 (1944). https://doi.org/10.1038/154240b0

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