# Recent results from the Pierre Auger Observatory

## TL;DR

This paper reports recent findings from the Pierre Auger Observatory, including cosmic ray energy spectrum, composition, anisotropy, and updates on the AugerPrime upgrade, advancing understanding of ultra-high-energy cosmic rays.

## Contribution

It provides new measurements of cosmic ray spectrum, composition, and anisotropy, and discusses the progress of the Observatory's upgrade, AugerPrime.

## Key findings

- Cosmic ray spectrum measured from 10^{17.5} to above 10^{20} eV.
- Detection of large-scale anisotropy above 8 x 10^{18} eV.
- Indications of anisotropy at intermediate scales above 4 x 10^{19} eV.

## Abstract

In this paper some recent results from the Pierre Auger Collaboration are presented. These are the measurement of the energy spectrum of cosmic rays over a wide range of energies ($10^{17.5}$ to above $10^{20}$ eV), studies of the cosmic-ray mass composition with the fluorescence and surface detector of the Observatory, the observation of a large-scale anisotropy in the arrival direction of cosmic rays above 8 x $10^{18}$ eV and indications of anisotropy at intermediate angular scales above 4 x $10^{19}$ eV. The astrophysical implications of the spectrum and composition results are also discussed. Finally the progress of the upgrade of the Observatory, AugerPrime is presented.