In the last fifteen years radio detection made it back to the list of promising techniques for
extensive air showers, firstly, due to the installation and successful operation of digital radio …

The origin and nature of extreme energy cosmic rays (EECRs), which have energies above
the 5⋅ 10 19 eV 5\cdot10^19~eV—the Greisen-Zatsepin-Kuzmin (GZK) energy limit, is one …

We present a new method for probing the hadronic interaction models at ultrahigh energy
and extracting details about mass composition. This is done using the time profiles of the …

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 …

The Pierre Auger Observatory [1] is the largest cosmic ray Observatory built so far. It is
located in the Argentinian pampa near Malargüe, Mendoza province and has been in …

Ultra-high energy cosmic rays (UHECRs) are charged particles of energies above eV that
originate outside the Galaxy. Because the flux of the UHECRs at Earth is very small, the only …

Neutrinos play a fundamental role in the understanding of the origin of ultrahigh-energy
cosmic rays. They interact through charged and neutral currents in the atmosphere …

We report a multi-resolution search for anisotropies in the arrival directions of cosmic rays
detected at the Pierre Auger Observatory with local zenith angles up to 80◦ and energies in …

Variation of the atmospheric conditions affect the signals from the extended air shower
(EAS) which can be detected at ground level with arrays of surface detectors, such as the …

Cosmic rays are the most energetic particles observed in the universe. With energies of
more than 1020 eV p «16 Joulesq concentrated in a single particle, their energy is seven …