We explore the possibility that the recently detected dipole anisotropy in the arrival
directions of> 8 EeV ultra-high-energy cosmic-rays (UHECRs) arises due to the large-scale …

The Pierre Auger Observatory's (PAO) shower profile measurements can be used to
constrain the chemical composition of the ultra-high energy cosmic ray (UHECR) spectrum …

The beginning of the 21st century has brought much progress into the field of Ultra High
Energy Cosmic Rays particularly through the completion of the Pierre Auger Observatory …

Depending on the environment of the acceleration processes for ultra-high energy cosmic
rays, photons and neutrinos may be produced by interactions in the sources. If so …

Recent results from the Pierre Auger Observatory, showing energy-dependent chemical
composition of ultrahigh-energy cosmic rays (UHECRs) with a growing fraction of heavy …

The energy spectrum of primary cosmic rays extends beyond the GZK cutoff energy by
AGASA observation, while there seems to be the cutoff in HiResI observation. The …

The origin of ultra-high-energy cosmic rays (UHECRs), which reach energy 1020 eV,
remains the mysteries in modern astrophysics. The main obstacles in identifying the origin of …

Radio galaxies are intensively discussed as the sources of cosmic rays observed above
about 3× 10 18 eV, called ultra-high energy cosmic rays (UHECRs). We present a first …

Abstract Recently the Telescope Array collaboration reported an observation of cosmic ray
event with very high energy 244 EeV (2.44× 10 20 eV). Importantly, the event is hard to …

Due to experiments like the Pierre Auger Observatory (Auger) and the Telescope Array (TA),
high-statistics data is becoming available on the energy spectrum, the composition and the …