Abstract:Experimental results from Haverah Park, Yakutsk, AGASA and Fly's Eye are reviewed. All these experiments work in the energy range above 10 17 eV. The 'dip' structure around 10 18.5 eV in the energy spectrum is well established by all the experiments, though the exact position differs slightly. Fly's Eye and Yakutsk results on the chemical composition indicate that the cosmic rays are getting lighter over the energy range from 10 17 eV to 10 19 eV, but the exact fraction is hadronic interaction model dependent,… Show more
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