High-energy cosmic rays are observed indirectly by detecting the extensive air showers
initiated in Earth's atmosphere. The interpretation of these observations relies on accurate …

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 …

The present white paper is submitted as part of the “Snowmass” process to help inform the
long-term plans of the United States Department of Energy and the National Science …

Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-
energy events thought to come from extragalactic sources. Their arrival is infrequent, so …

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 …

Abstract The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to
accurately observe ultra-high-energy cosmic rays (UHECRs) and cosmic neutrinos from …

Abstract The Giant Radio Array for Neutrino Detection (GRAND) is a planned large-scale
observatory of ultra-high-energy (UHE) cosmic particles, with energies exceeding 10 8 GeV …

We present a suite of models of the coherent magnetic field of the Galaxy based on new
divergence-free parametric functions describing the global structure of the field. The model …

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 …

This article presents the design of the Radio Neutrino Observatory Greenland (RNO-G) and
discusses its scientific prospects. Using an array of radio sensors, RNO-G seeks to measure …