Cosmic Rays above the Knee

Abstract

An overview on the present observational status and phenomenological understanding of cosmic rays above 10^16 eV is given. Above these energies the cosmic ray flux is expected to be gradually dominated by an extra-galactic component. In order to investigate the nature of this transition, current experimental activities focus on the measurement of the cosmic ray flux and composition at the 'ankle' or 'dip' feature at several EeV. At the ultra high energy end of the spectrum, the flux suppression above 50 EeV is now well established by the measurements of HiRes and the Pierre Auger Observatory and we may enter the era of charged particle astronomy.

Invited talk at the 21st European Cosmic Ray Symposium, 2008, Kosice

References in corpus (8)

• Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei
• Air Fluorescence Relevant for Cosmic-Ray Detection - Summary of the 5th Fluorescence Workshop, El Escorial 2007
• Correlation of the HIghest Energy Cosmic Rays with the Supergalactic Plane
• Latest Results from the Air Shower Simulation Programs CORSIKA and CONEX
• The rise and fall of top-down models as main UHECR sources
• On the measurement of the proton-air cross section using cosmic ray data
• Ultra High-Energy Interaction of CR protons
• Strong colour fields and cosmic ray showers at ultra-high energies