Abstract
The High Resolution Fly’s Eye Experiment (HiRes) in Utah is an air fluorescence telescope mapping the northern sky in cosmic rays at energies above 1018 eV. Since November 1999, HiRes has been operated in stereo mode, i.e. with two sites separated by 13 km to provide cosmic ray data of unprecedented quality of the northern sky. This paper focuses on first results from the stereoscopic data. We present a measurement of the primary chemical composition above 1018 eV, and results on the search for small‐scale anisotropies in the cosmic ray arrival distribution, with emphasis on the highest energies, where previous experiments have observed clustering.
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