We review open questions and prospects for progress in ultrahigh-energy cosmic ray
(UHECR) research, based on a series of discussions that took place during the “The High …

This review summarizes recent developments in the understanding of high-energy cosmic
rays. It focuses on galactic and presumably extragalactic particles in the energy range from …

We report a study of the distributions of the depth of maximum, X max, of extensive air-
shower profiles with energies above 1 0 17.8 eV as observed with the fluorescence …

Abstract The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is
the world׳ s largest cosmic ray observatory. The objectives of the Observatory are to probe …

The Pierre Auger Observatory has begun a major Upgrade of its already impressive
capabilities, with an emphasis on improved mass composition determination using the …

This is a review of the most resent results from the investigation of the ultrahigh energy
cosmic rays, particles of energy exceeding 10 18 eV. After a general introduction to the topic …

Abstract The Pierre Auger Observatory in Malargüe, Argentina, is designed to study the
properties of ultra-high energy cosmic rays with energies above 10 18 eV. It is a hybrid …

High-energy cosmic rays with energies exceeding 1017eV are frequently observed by
measurements of the fluorescence light induced by air showers. A major contribution to the …

The wind mission Aeolus of the European Space Agency was a groundbreaking
achievement for Earth observation. Between 2018 and 2023, the space-borne lidar …

Great advances have been made in the study of ultra-high energy cosmic rays (UHECR) in
the past 2 decades. These include the discovery of the spectral cut-off near eV and complex …