Contribution Oral presentation
Measurement of Ultra-High Energy Cosmic Rays: Present and Future
Ultra-High Energy Cosmic Rays (UHECRs) with energy reaching 10²⁰ eV have been measured by large-scale hybrid detectors employing an array of ground particle detectors and air fluorescence telescopes. Recent findings from Telescope Array (TA) in Utah, USA and Pierre Auger Observatory (PAO) in Malargue, Argentina include a sudden flux decrease above ~10¹⁹‧⁷ eV possibly caused by the predicted Greisen-Zatsepin-Kuzmin (GZK) interaction of UHECR with CMBs, measurements of primary nuclear compositions, proton or heavier nuclei, and hints of anisotropy and association with Active Galactic Nuclei (AGN) in the cosmic ray arrival directions. The detectors of TA and PAO will be introduced with plans of near future extensions. Further RDs and technical challenges including the MHz/GHz radio detection from the air shower and space observation of air fluorescence (JEM-EUSO, TUS and KLYPVE) will be reviewed.