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To estimate the energy of any cosmic ray event detected by the Pierre Auger Observatory, the detectors have to be calibrated.

Are you interested in brushing up your Danish? Read a feature article on the Pierre Auger Observatory.

Cosmic rays are mostly charged particles that  reach Earth from outer space.

The Pierre Auger Collaboration has investigated the constraining power of the cosmic ray spectrum and composition measurements with respect to the properties of the possible sources.

The Pierre Auger Collaboration has searched for the possible presence of photons with energies exceeding 10¹⁸ eV in the flux of cosmic rays arriving at Earth.

One of the most pressing mysteries in astroparticle physics is the composition and origin of cosmic rays at energies around 1 EeV = 10¹⁸ eV.