The UHE cosmic ray spectrum

Details The UHE cosmic ray spectrum The UHE cosmic ray spectrum

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..264..373s&link_type=abstract

In: Particle acceleration in cosmic plasmas; Proceedings of the Workshop, Bartol Research Inst., Newark, DE, Dec. 4-6, 1991 (A93

Physics

1

Cosmic Rays, Energy Spectra, Radiation Detectors, High Resolution, Particle Flux Density, Photoproduction

Scientific paper

The current understanding of the UHE cosmic ray spectrum is reviewed. The spectrum obeys a power law with index -2.6 from GeV to PeV (10 exp 15 eV) energies and then steepens to an index of between -3.0 and -3.1. The new power law continues up to an energy of 10 EeV (10 exp 19 eV). The spectrum must eventually terminate, either by the exhaustion of the acceleration mechanism or due to propagation effects. Two basic techniques for studying the ultrahigh-energy cosmic ray spectrum - ground arrays and the Fly's Eye detector - are described. Much larger detectors which are now either coming into operation or are in the prototype and planning stages - the AGASA array, EAS-1000, and High Resolution Fly's Eye - are presented.

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