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ABSTRACT THERE has been little success in the search for anisotropies in the arrival directions of ultra high energy cosmic rays. Data on 50 events of very high energy, having an arrival

direction which is ‘not obviously isotropic’, have however, been collected by the Sydney extensive air shower group1. The data were recorded over a period of 5 yr and, as the world total of

such events is likely to increase only rather slowly, this seems to be the appropriate time to combine these data with comparable data from the Northern Hemisphere arrays operated at Cornell

(United States), Haverah Park (United Kingdom) and Volcano Ranch (United States). The arrival directions of 87 showers with primary energies above a few times 1019 eV are discussed here. It

is shown that there are no large deviations from an isotropic distribution and it is concluded that the ultra high energy cosmic rays are most likely to come predominantly from

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Astronomy, University of New Mexico, Albuquerque, New Mexico J. LINSLEY * Department of Physics, University of Leeds, Leeds, UK A. A. WATSON Authors * J. LINSLEY View author publications You

can also search for this author inPubMed Google Scholar * A. A. WATSON View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints

and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE LINSLEY, J., WATSON, A. Isotropy of the arrival directions of ultra high energy cosmic rays. _Nature_ 249, 816–817 (1974).

https://doi.org/10.1038/249816a0 Download citation * Received: 14 February 1974 * Revised: 12 March 1974 * Issue Date: 28 June 1974 * DOI: https://doi.org/10.1038/249816a0 SHARE THIS ARTICLE

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