Abstract
The High Resolution Fly's Eye (HiRes) collaboration has measured the spectrum of ultrahigh energy cosmic rays in the energy range from 1017.2 to 1020.2 eV. Two spectral features appear. We clearly see one, called the “ankle”, at about 1018.5 eV. We also have evidence for a high-energy suppression of the cosmic ray flux at an energy of about 1019.8 eV, where the GZK suppression is expected to occur. We have also measured the composition of cosmic rays between 1018.0 and 1019.4 eV using the Xmax method. We have searched for anisotropy in the arrival directions of ultra high energy cosmic rays. Results are presented on these topics.
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