High Resolution Fly's Eye Cosmic Ray Detector

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The High Resolution Fly's Eye, or HiRes, detector is an atmospheric fluorescence detector that operated in western Utah from December 1999 until March 2006. The detector was designed to observe ultra-high energy cosmic ray air showers in the lower atmosphere.

HiRes was composed of two sites separated by 13 km, located on two hilltops in Dugway Proving Grounds, a U.S. military testing facility.

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