Abstract
THE variation of the cosmic-ray intensity at sea-level with geomagnetic latitude shows a sharp change in slope in the region of 50°, the intensity remaining very nearly constant between this latitude and the pole. This latitude cut-off is present at a height of 30,000 ft.1 and, according to Cosyns2, still occurs at the same latitude at a pressure-level of 7 cm. mercury. Carmichael and Dymond's balloon flights3, when compared with those of Pfotzer, also indicate no increase in intensity between 50° N. and 88° N.
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References
Biehl, A. T., Neher, H. V., and Roesch, W. C., Phys. Rev., 76, 914 (1949).
Cosyns, M. G. E., Nature, 137, 616 (1936).
Carmichael, H., and Dymond, E. G., Proc. Roy. Soc., A, 171, 321 (1939).
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Rossi, B. (private communication).
Kane, E. O., Shanley, T. J. B., and Wheeler, J. A., Rev. Mod. Phys., 21, 51 (1949).
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Malmfors, K. G., Ark. Mat. Astro. Fys., 32 A, No. 8 (1945).
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DOLBEAR, D., ELLIOT, H. Cosmic Rays and the Magnetic Field of the Sun. Nature 165, 353–354 (1950). https://doi.org/10.1038/165353a0
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DOI: https://doi.org/10.1038/165353a0
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