Cosmic Rays and the Great Sunspot Group of January 29–February 12, 1946


LARGE variations in the intensity of cosmic rays have been observed during the period of the recent great sunspot group, January 29–February 12, 1946. According to information kindly given by the Royal Observatory, a magnetic storm, a considerable number of solar flares, and radio fade-outs were also observed during this period. The intensity of cosmic rays has been recorded in London and Manchester ; the apparatus used in London has been previously described by one of us1, and that used in Manchester was similar in principle, although differing in some details. The most important difference was the use of two instead of three trays of Geiger–Müller counters, which meant that rather more particles approaching from an inclined direction were recorded.

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  1. 1

    Duperier, Terr. Mag. and Atmos. Elect, 49, 1 (1944).

  2. 2

    Duperier, Proc. Phys. Soc, 57, 472 (1945).

  3. 3

    Duperier, Nature, 149, 579 (1942).

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DUPERIER, A., MCCAIG, M. Cosmic Rays and the Great Sunspot Group of January 29–February 12, 1946. Nature 157, 477 (1946).

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