Abstract
ONE of the most interesting features of high energy cosmic radiation is its striking isotropy. A large degree of isotropy would be an obvious consequence of an extragalactic origin for cosmic rays, but there are some difficulties in interpreting it in terms of a galactic origin. Although there are theoretical arguments in favour of the latter, the existence of cosmic-ray anisotropy in the Galaxy has not yet been proved experimentally. Here we report a measurement, point M in Fig. 1, which proves the existence of an anisotropy in galactic cosmic radiation. It was detected by examining extensive air showers produced by cosmic-ray primaries of energies ∼6 × 1013 eV (which are certainly not affected by solar modulation).
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GOMBOSI, T., KOTA, J., SOMOGYI, A. et al. Anisotropy of cosmic radiation in the Galaxy. Nature 255, 687–689 (1975). https://doi.org/10.1038/255687a0
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DOI: https://doi.org/10.1038/255687a0
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