Telescope Array (TA) is a hybrid detector of a surface detector array and fluorescence
telescopes. This hybrid detector will measure the energy spectrum, anisotropy and …

We calculate the number density and luminosity of the sources of ultra-high energy cosmic
rays (UHECRs), using the information about the small scale anisotropies and the observed …

It is almost 50 years since cosmic rays with energies of the order of 100 EeV (1 EeV≡ 1018
eV) were first reported [1]. Soon after the initial observation of such cosmic rays it was …

The search for ultra-high energy (UHE) photons is a key to reveal the origin of the highest
energetic cosmic rays. Nuclei interacting with the extra-galactic background light, dominantly …

The measurement of the ultra high energy cosmic ray (UHECR) spectrum is strongly affected
by uncertainties on the reconstructed energy. The determination of the presence or absence …

We estimate the local number density of sources of ultra-high-energy cosmic rays (UHECRs)
based on the statistical features of their arrival direction distribution. We calculate the arrival …

K-EUSO is a planned mission of the JEM-EUSO program for the study of ultra-high energy
cosmic rays (UHECR) from space, to be deployed on the International Space Station. The K …

We examine the anisotropy of the arrival directions of twenty seven ultra high energy cosmic
rays detected by the Pierre Auger Collaboration. We confirm the anisotropy of the arrival …

The region of the toe in the cosmic-ray spectrum, located at about 45 EeV by the Pierre
Auger Collaboration, is of primary interest in the search for the origin of ultra-high energy …

Abstract The Pierre Auger Observatory has been detecting ultra-high energy cosmic rays
(UHECRs) for more than fifteen years. An essential feature of the Observatory is its hybrid …