The cosmic ray measurements above 1 TeV

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Cosmic Rays, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

We summarize the updated results on the measurements of cosmic rays with energies above 1 TeV (1012 eV). Most of the measurements are consistent with our baseline picture of origins of the cosmic rays that the higher energy extragalactic component is starting to take over the galactic cosmic rays at around 3×1018~1019 eV. The inconsistency between the measurements on the mass composition at the ``Knee'' region (~1015 eV) needs to be addressed, however, to make more solid conclusion on the origin of the galactic cosmic rays. The hybrid measurement-based approach is shown to be of great help to understand the possible systematics in the different experiments in this energy region. The highlight among the results reported in the conference is the firm detection by the AGASA group of anisotropy of 1018 eV cosmic rays associated with direction of the galactic center. In the highest energy end the existence of cosmic rays beyond the expected GZK cutoff (5×1019 eV) have been established to challenge our understanding of the high energy particle emissions in extragalactic space. .

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