In 1965 it was discovered that cosmic ray air showers emit impulsive radio signals at
frequencies below 100 MHz. After a period of intense research in the 1960s and 1970s …

The observation of electromagnetic radiation from radio to γ-ray wavelengths has provided a
wealth of information about the Universe. However, at PeV (10 15 eV) energies and above …

The Glashow resonance describes the resonant formation of a W− boson during the
interaction of a high-energy electron antineutrino with an electron, peaking at an …

Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies
observed in nature. Clues to their origin come from studying the distribution of their arrival …

The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a newly formed, global
collaboration dedicated to observing and studying cosmic rays (CR) and cosmic-ray …

We present a combined fit of a simple astrophysical model of UHECR sources to both the
energy spectrum and mass composition data measured by the Pierre Auger Observatory …

The interaction of ultra-high-energy cosmic rays (UHECRs) with pervasive photon fields
generates associated cosmogenic fluxes of neutrinos and photons due to photohadronic …

We present a new parametrization of the cosmic-ray flux and its mass composition over an
energy range from 10 GeV to $10^{11} $ GeV. Our approach is data-driven and relies on …

High-energy cosmic neutrinos carry unique information about the most energetic non-
thermal sources in the Universe. This white paper describes the outstanding astrophysics …

A search for ultra-high energy photons with energies above 1EeV is performed using nine
years of data collected by the Pierre Auger Observatory in hybrid operation mode. An …