News from Cosmic Ray Air Showers (ICRC 2019 -- Cosmic Ray Indirect Rapport)
Frank G. Schr\"oder

TL;DR
This paper summarizes recent advances in cosmic-ray air-shower measurements, revealing new spectral features, composition variations, and anisotropy signals, while highlighting ongoing efforts to understand cosmic-ray origins and improve experimental techniques.
Contribution
It reports updated measurements from multiple observatories, identifies new spectral features and composition trends, and discusses future experimental strategies for cosmic-ray research.
Findings
Discovery of a softening in the light component around 10^13.5 eV
Observation of a smooth second knee extending over 100-200 PeV
Confirmation of a changing mixture of protons and nuclei up to several 10 EeV
Abstract
This rapport summarizes the cosmic-ray indirect (CRI) session of the 36th ICRC conference. Updated measurements from several air-shower arrays with higher precision lead to the discovery of new features in the energy spectrum: HAWC measures a softening of the light component (p+He) around eV; measurements of the Pierre Auger Observatory show that the second knee is a smooth feature extending at least over the range of PeV and that the energy spectrum between the ankle and the cut-off cannot be described by a simple broken power law. Measurements of the mass composition confirm that the composition is a varying mixture of protons and nuclei at least up to several EeV. A joint effort of several collaborations helps to better assess deficiencies of hadronic interaction models, e.g., by quantifying the muon deficit in the models over the shower energy.…
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Dark Matter and Cosmic Phenomena · Gamma-ray bursts and supernovae
