Akeno Giant Air Shower Array
The Akeno Giant Air Shower Array (AGASA) is a very large surface array designed to study the origin of ultra-high-energy cosmic rays. It covers an area of 100 km2 and consists of 111 surface detectors and 27 muon detectors. Array experiments such as this one are used to detect air shower particles.
The results from AGASA were used to calculate the energy spectrum and anisotropy of cosmic rays. The results helped to confirm the existence of ultra-high energy cosmic rays (>×1019 eV5), such as the so-called "Oh-My-God" particle that was observed by the Fly's Eye experiment run by the University of Utah.
The Pierre Auger Observatory plans to improve on the results from AGASA.
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