The cosmic ray measurements above 1 TeV

Yoshida, Shigeru
June 2000
AIP Conference Proceedings;2000, Vol. 516 Issue 1, p180
Academic Journal
We summarize the updated results on the measurements of cosmic rays with energies above 1 TeV (10[sup 12] 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 3×10[sup 18]∼10[sup 19] eV. The inconsistency between the measurements on the mass composition at the “Knee” region (∼10[sup 15] 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 10[sup 18] 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 (5×10[sup 19] eV) have been established to challenge our understanding of the high energy particle emissions in extragalactic space. © 2000 American Institute of Physics.


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