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 extra-Galactic sources.
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