The Cosmic-Ray Observations of December 4, 1957


A RECENT communication from Legrand and Helary1 reports an increase in the total component of cosmic radiation at Paris on December 4, 1957. The increase amounted to about 18 per cent and extended over three hours with the maximum occurring at 2245 U.T. A small increase in the nucleonic component at Thule preceded the Paris event by about three hours. Optical and radio data indicate a flare of importance 1 on the western hemisphere of the Sun at 1657 U.T. (ref. 2).

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  1. 1

    Legrand, J. P., and Helary, A., Nature, 187, 397 (1960).

  2. 2

    Solar Geophysical Data, B (Jan. 1958).

  3. 3

    Collins, C., and Jelly, D. H., Nature, 189, 128 (1961).

  4. 4

    Cosmic Ray Intensity during the I.G.Y., No. 1 (Tokyo, March 1959).

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WILSON, B. The Cosmic-Ray Observations of December 4, 1957. Nature 190, 615–616 (1961).

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