Abstract
The High Resolution Fly's Eye Experiment (HiRes) is the only operational experiment of it's kind in the world. HiRes is the direct descendent of the original Fly's Eye experiment. HiRes is designed to make stereo observations of Ultra High Energy Cosmic Rays (UHECR) via atmospheric fluorescence. HiRes will measure the energy spectrum, composition, and anisotropy of UHECR. The first of two sites, HiRes-1, has been in operation since June, 1997. Over 1000 hours of good weather data has been taken, monocularly, and analyzed. A preliminary energy spectrum is presented based on this data set and compared to the results from the original Fly's Eye experiment. The second site, HiRes-2, began limited data-taking in April, 1999. The installation of the HiRes-2 detector is now complete and commissioning is underway. Some high energy events have already been observed in stereo.
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