Explanipedia

Exploring the Ultra-High-Energy Universe: Highlights from the Pierre Auger Observatory Open

M. Roth, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

The Pierre Auger Observatory is the world’s largest facility dedicated to studying ultra-high-energy cosmic rays (UHECRs). Located in Argentina, it spans 3,000 square kilometers and utilizes a hybrid detection system comprising over 1,600 …

Scaler data from the Pierre Auger Observatory as a proxy of solar activity Open

C. Taricco, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Solar activity variations strongly impact the modulation of the flux of low-energy Galactic Cosmic Rays (GCRs) reaching the Earth. The secondary particles, which originate from the interaction of GCRs with the atmosphere, can be revealed b…

Search for Ultra-High-Energy Neutrinos at the Pierre Auger Observatory: New Triggers, Methods, and Constraints Open

Srijan Sehgal, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

The Pierre Auger Observatory has the capability to identify neutrino-induced extensive air showers above $10^{17}$ eV by using its large Surface Detector (SD) array. Data from the Observatory have been used to set some of the most stringen…

Observation of the Shadows of the Moon and Sun Using the Pierre Auger Observatory at an Average Energy of $7\times10^{17}\,$eV Open

Katarína Simkova, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324907.pdf (Publisher’s version ) (Open Access)

Detection of Spaceborne Lasers with the Pierre Auger Observatory Open

M. Unger, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324914.pdf (Publisher’s version ) (Open Access)

Combined fit above 0.1 EeV to the cosmic-ray spectrum and composition measured with the Pierre Auger Observatory Open

Esteban Roulet, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324880.pdf (Publisher’s version ) (Open Access)

A Universal Mapping Between Proton-Air Interaction Variables and Air Shower Observables: Depth of Shower Maximum and Muon Content Open

Miguel A. Martins, Lorenzo Cazon, R. Conceição, Felix Riehn · 2025

We introduce a set of new multiparticle production variables derived from the energy spectrum of secondary hadrons in ultra-high-energy proton-air interactions. The distributions of these variables can be measured within the phase space ac…

Muon Signal Charge in the Underground Muon Detector of AugerPrime Open

M. Scornavacche, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324908.pdf (Publisher’s version ) (Open Access)

Constraints on the spread of nuclear masses in ultra-high-energy cosmic rays based on the Phase I hybrid data from the Pierre Auger Observatory Open

Alexey Yushkov, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

We present an analysis of the correlation between the depth of the maximum of air-shower profiles and the signal in water-Cherenkov stations in events registered simultaneously by the fluorescence and surface detectors of the Pierre Auger …

Results and plans to apply interferometry to air shower observations at the Pierre Auger Observatory Open

Pim van Dillen, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324910.pdf (Publisher’s version ) (Open Access)

AugerPrime: Status and first results Open

David Schmidt, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324884.pdf (Publisher’s version ) (Open Access)

Study of solar activity with AERA at the Pierre Auger Observatory Open

R. M. de Almeida, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324933.pdf (Publisher’s version ) (Open Access)

Measurement of the Inelastic Proton-Proton Cross-Section at $\sqrt{s} \geq 40$ TeV Using the Hybrid Data of the Pierre Auger Observatory Open

Олена Ткаченко, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Measuring proton-proton interaction cross-sections at center-of-mass energies above 40 TeV remains a significant challenge in particle physics. The Pierre Auger Observatory provides a unique opportunity to study the interactions at the hig…

Reconstructing Air-Shower Observables using a Universality-Based Model at the Pierre Auger Observatory Open

Darko Veberič, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324913.pdf (Publisher’s version ) (Open Access)

Search for UHE neutrinos from GRBs with the Pierre Auger Observatory Open

Yago Lema-Capeans, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

We report on the search for ultra-high-energy neutrinos from the prompt emission of gamma-ray bursts (GRBs) using Surface Detector (SD) data from Phase I of the Pierre Auger Observatory (2004-2021). A total of 570 GRBs occur within the mos…

Simultaneous observations of multiple ELVES and SPRITES at the Pierre Auger Observatory Open

R. Mussa, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Since 2014, the Pierre Auger Observatory has exploited a dedicated trigger and its very high time resolution to study ELVES and harvest record samples of multiple ELVES using the Fluorescence Detector (FD). In 2017, after extending the rea…

Measurement and Interpretation of UHECR Mass Composition at the Pierre Auger Observatory Open

Eric William Mayotte, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324883.pdf (Publisher’s version ) (Open Access)

Update on testing of air-shower modelling using combined data of the Pierre Auger Observatory and phenomenological consequences Open

J. Vícha, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324911.pdf (Publisher’s version ) (Open Access)

Cloud Detection using Night Sky Background Light at the Pierre Auger Observatory Open

Fedor Tairli, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324916.pdf (Publisher’s version ) (Open Access)

Event reconstruction with the Radio detector of the Pierre Auger Observatory Open

Simon Strähnz, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324906.pdf (Publisher’s version ) (Open Access)

Characterizing the neutron component of extensive air showers with the Surface-Scintillator Detectors of AugerPrime Open

Tobias Schulz, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Neutrons are the only neutral hadrons that remain stable over the timescale of an air-shower development. Their energy is lost only through hadronic interactions and quasi-elastic scattering, which results in their high abundance at the gr…

Graph Neural Networks for Photon Searches with the Underground Muon Detector of the Pierre Auger Observatory Open

Ezequiel Rodriguez, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Ultra-high-energy photons have long been sought as tracers of the most energetic processes in the Universe. Several sources can contribute to a diffuse photon flux, including interactions of cosmic rays with Galactic matter and radiation f…

Measurement of the cosmic-ray energy spectrum above 2.5 EeV using 19 years of operation of the Pierre Auger Observatory Open

Diego Ravignani, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

We present the spectrum of cosmic rays with energies above 2.5 EeV measured at the Pierre Auger Observatory after 19 years of operation, covering the period before the AugerPrime upgrade. Two independent event sets from the surface array o…

Performance and extensions of the central data acquisition systems for Phase II of the Pierre Auger Observatory Open

Paul Filip, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

Contains fulltext : 324857.pdf (Publisher’s version ) (Open Access)

A composition-informed search for large-scale anisotropy with the Pierre Auger Observatory Open

Geraldina Golup, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

The large-scale dipolar structure in the arrival directions of ultra-high-energy cosmic rays with energies above $8\,$EeV observed by the Pierre Auger Collaboration is a well-established anisotropy measurement. This anisotropy is understoo…

Update on the intermediate arrival-direction analyses of the Pierre Auger Observatory Open

Lorenzo Apollonio, Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte , et al. · 2025

We present an update on the arrival-direction analyses conducted on intermediate angular scales using the complete Phase I data of the Pierre Auger Observatory up to the end of 2022 with a total exposure of $135{,}000\,\text{km}^2\,\text{s…

Constraining the origin of the highest-energy cosmic-ray events detected by the Pierre Auger Observatory: a three-dimensional approach Open

Marta Bianciotto, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

Unveiling the sources of ultra-high-energy cosmic rays remains one of the main challenges of high-energy astrophysics. Measurements of anisotropies in their arrival directions are key to identifying their sources, yet magnetic deflections …

Latest Results from the Searches for Photons at the Highest Energies with the Pierre Auger Observatory Open

Pierpaolo Savina, Adila Abdul Halim, P. Abreu, Marco Aglietta, I. Allekotte , et al. · 2025

The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above $0.2$ EeV providing unprecedented exposure to ultra-high-energy (UHE) cosmic rays and specifically to UHE photons. The Observatory measures …

New full-sky studies of the distribution of ultra-high-energy cosmic-ray arrival directions Open

A. González Ureña, Ryo Higuchi, Sang J. Kim, Mikhail Kuznetsov, Federico Maria Mariani , et al. · 2025

International audience

Socioeconomic Impact of the Pierre Auger Observatory Open

I. Allekotte, Adila Abdul Halim, P. Abreu, M. Aglietta, Kévin Almeida Cheminant , et al. · 2025

Contains fulltext : 324943.pdf (Publisher’s version ) (Open Access)

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