Related papers: Atmospheric shower fluctuations and the constant i…

Measurement of the Depth of Maximum of Air-Shower Profiles with energies between $\mathbf{10^{18.5}}$ and $\mathbf{10^{20}}$ eV using the Surface Detector of the Pierre Auger Observatory and Deep Learning

We report an investigation of the mass composition of cosmic rays with energies from 3 to 100 EeV (1 EeV=$10^{18}$ eV) using the distributions of the depth of shower maximum $X_\mathrm{max}$. The analysis relies on ${\sim}50,000$ events…

High Energy Astrophysical Phenomena · Physics 2025-02-07 The Pierre Auger Collaboration , A. Abdul Halim , P. Abreu , M. Aglietta , I. Allekotte , K. Almeida Cheminant , A. Almela , R. Aloisio , J. Alvarez-Muñiz , J. Ammerman Yebra , G. A. Anastasi , L. Anchordoqui , B. Andrada , L. Andrade Dourado , S. Andringa , L. Apollonio , C. Aramo , P. R. Araújo Ferreira , E. Arnone , J. C. Arteaga Velázquez , P. Assis , G. Avila , E. Avocone , A. Bakalova , F. Barbato , A. Bartz Mocellin , C. Berat , M. E. Bertaina , G. Bhatta , M. Bianciotto , P. L. Biermann , V. Binet , K. Bismark , T. Bister , J. Biteau , J. Blazek , C. Bleve , J. Blümer , M. Boháčová , D. Boncioli , C. Bonifazi , L. Bonneau Arbeletche , N. Borodai , J. Brack , P. G. Brichetto Orchera , F. L. Briechle , A. Bueno , S. Buitink , M. Buscemi , M. Büsken , A. Bwembya , K. S. Caballero-Mora , S. Cabana-Freire , L. Caccianiga , F. Campuzano , R. Caruso , A. Castellina , F. Catalani , G. Cataldi , L. Cazon , M. Cerda , B. Čermáková , A. Cermenati , J. A. Chinellato , J. Chudoba , L. Chytka , R. W. Clay , A. C. Cobos Cerutti , R. Colalillo , M. R. Coluccia , R. Conceição , A. Condorelli , G. Consolati , M. Conte , F. Convenga , D. Correia dos Santos , P. J. Costa , C. E. Covault , M. Cristinziani , C. S. Cruz Sanchez , S. Dasso , K. Daumiller , B. R. Dawson , R. M. de Almeida , B. de Errico , J. de Jesús , S. J. de Jong , J. R. T. de Mello Neto , I. De Mitri , J. de Oliveira , D. de Oliveira Franco , F. de Palma , V. de Souza , E. De Vito , A. Del Popolo , O. Deligny , N. Denner , L. Deval , A. di Matteo , J. A. do , M. Dobre , C. Dobrigkeit , J. C. D'Olivo , L. M. Domingues Mendes , Q. Dorosti , J. C. dos Anjos , R. C. dos Anjos , J. Ebr , F. Ellwanger , M. Emam , R. Engel , I. Epicoco , M. Erdmann , A. Etchegoyen , C. Evoli , H. Falcke , G. Farrar , A. C. Fauth , T. Fehler , F. Feldbusch , F. Fenu , A. Fernandes , B. Fick , J. M. Figueira , P. Filip , A. Filipčič , T. Fitoussi , B. Flaggs , T. Fodran , T. Fujii , A. Fuster , C. Galea , B. García , C. Gaudu , A. Gherghel-Lascu , P. L. Ghia , U. Giaccari , J. Glombitza , F. Gobbi , F. Gollan , G. Golup , M. Gómez Berisso , P. F. Gómez Vitale , J. P. Gongora , J. M. González , N. González , D. Góra , A. Gorgi , M. Gottowik , F. Guarino , G. P. Guedes , E. Guido , L. Gülzow , S. Hahn , P. Hamal , M. R. Hampel , P. Hansen , D. Harari , V. M. Harvey , A. Haungs , T. Hebbeker , C. Hojvat , J. R. Hörandel , P. Horvath , M. Hrabovský , T. Huege , A. Insolia , P. G. Isar , P. Janecek , V. Jilek , J. A. Johnsen , J. Jurysek , K. -H. Kampert , B. Keilhauer , A. Khakurdikar , V. V. Kizakke Covilakam , H. O. Klages , M. Kleifges , F. Knapp , J. Köhler , F. Krieger , N. Kunka , B. L. Lago , N. Langner , M. A. Leigui de Oliveira , Y. Lema-Capeans , A. Letessier-Selvon , I. Lhenry-Yvon , L. Lopes , L. Lu , Q. Luce , J. P. Lundquist , A. Machado Payeras , M. Majercakova , D. Mandat , B. C. Manning , P. Mantsch , F. M. Mariani , A. G. Mariazzi , I. C. Mariş , G. Marsella , D. Martello , S. Martinelli , O. Martínez Bravo , M. A. Martins , H. -J. Mathes , J. Matthews , G. Matthiae , E. Mayotte , S. Mayotte , P. O. Mazur , G. Medina-Tanco , J. Meinert , D. Melo , A. Menshikov , C. Merx , S. Michal , M. I. Micheletti , L. Miramonti , S. Mollerach , F. Montanet , L. Morejon , K. Mulrey , R. Mussa , W. M. Namasaka , S. Negi , L. Nellen , K. Nguyen , G. Nicora , M. Niechciol , D. Nitz , D. Nosek , V. Novotny , L. Nožka , A. Nucita , L. A. Núñez , C. Oliveira , M. Palatka , J. Pallotta , S. Panja , G. Parente , T. Paulsen , J. Pawlowsky , M. Pech , J. Pękala , R. Pelayo , V. Pelgrims , L. A. S. Pereira , E. E. Pereira Martins , C. Pérez Bertolli , L. Perrone , S. Petrera , C. Petrucci , T. Pierog , M. Pimenta , M. Platino , B. Pont , M. Pothast , M. Pourmohammad Shahvar , P. Privitera , M. Prouza , S. Querchfeld , J. Rautenberg , D. Ravignani , J. V. Reginatto Akim , M. Reininghaus , A. Reuzki , J. Ridky , F. Riehn , M. Risse , V. Rizi , W. Rodrigues de Carvalho , E. Rodriguez , J. Rodriguez Rojo , M. J. Roncoroni , S. Rossoni , M. Roth , E. Roulet , A. C. Rovero , A. Saftoiu , M. Saharan , F. Salamida , H. Salazar , G. Salina , J. D. Sanabria Gomez , F. Sánchez , E. M. Santos , E. Santos , F. Sarazin , R. Sarmento , R. Sato , P. Savina , C. M. Schäfer , V. Scherini , H. Schieler , M. Schimassek , M. Schimp , D. Schmidt , O. Scholten , H. Schoorlemmer , P. Schovánek , F. G. Schröder , J. Schulte , T. Schulz , S. J. Sciutto , M. Scornavacche , A. Sedoski , A. Segreto , S. Sehgal , S. U. Shivashankara , G. Sigl , K. Simkova , F. Simon , R. Smau , R. Šmída , P. Sommers , R. Squartini , M. Stadelmaier , S. Stanič , J. Stasielak , P. Stassi , S. Strähnz , M. Straub , T. Suomijärvi , A. D. Supanitsky , Z. Svozilikova , Z. Szadkowski , F. Tairli , A. Tapia , C. Taricco , C. Timmermans , O. Tkachenko , P. Tobiska , C. J. Todero Peixoto , B. Tomé , Z. Torrès , A. Travaini , P. Travnicek , M. Tueros , M. Unger , R. Uzeiroska , L. Vaclavek , M. Vacula , J. F. Valdés Galicia , L. Valore , E. Varela , V. Vašíčková , A. Vásquez-Ramírez , D. Veberič , I. D. Vergara Quispe , V. Verzi , J. Vicha , J. Vink , S. Vorobiov , C. Watanabe , A. A. Watson , A. Weindl , L. Wiencke , H. Wilczyński , D. Wittkowski , B. Wundheiler , B. Yue , A. Yushkov , O. Zapparrata , E. Zas , D. Zavrtanik , M. Zavrtanik

Air Fluorescence Relevant for Cosmic-Ray Detection - Summary of the 5th Fluorescence Workshop, El Escorial 2007

High-energy cosmic rays with energies exceeding $10^{17}$ eV are frequently observed by measurements of the fluorescence light induced by air showers. A major contribution to the systematic uncertainties of the absolute energy scale of such…

Astrophysics · Physics 2009-09-29 Fernando Arqueros , Joerg R. Hoerandel , Bianca Keilhauer

Towards the Composition of sub-PeV Cosmic Rays at IceCube

With the implementation of a low-energy trigger, the surface array of the IceCube Neutrino Observatory is able to record cosmic-ray induced air showers with a primary energy of a few hundred TeV. This extension of the energy range closes…

High Energy Astrophysical Phenomena · Physics 2025-11-11 Julian Saffer

Mass composition of cosmic rays above 0.1 EeV by the Yakutsk array data

The paper presents the results of the longitudinal development of extensive air showers (X$_{max}$) of ultra-high energies and mass composition of cosmic rays. The measurements of X$_{max}$ are based on data from observations of the…

High Energy Astrophysical Phenomena · Physics 2019-12-10 Stanislav Knurenko , Igor Petrov

Air Fluorescence Relevant for Cosmic-Ray Detection - Review of Pioneering Measurements

Cosmic rays with energies exceeding $10^{17}$ eV are frequently registered by measurements of the fluorescence light emitted by extensive air showers. The main uncertainty for the absolute energy scale of the measured air showers is coming…

Astrophysics · Physics 2008-12-18 Fernando Arqueros , Joerg R. Hoerandel , Bianca Keilhauer

Determination of the energy scale of cosmic ray measurements using the Auger Engineering Radio Array

The accurate determination of the absolute energy scale in cosmic ray measurements is both a challenging and fundamentally important task. We present how measurements of radio pulses from extensive air showers with the Auger Engineering…

Instrumentation and Methods for Astrophysics · Physics 2025-09-22 Tim Huege

Mean diurnal variations of cosmic ray intensity as measured by Andyrchi air shower array and Baksan underground scintillation telescope

The results of measuring diurnal variations of extensive air showers with energy above 100 TeV detected by the Andyrchi air shower array in 1995-2002 are presented. It is shown that solar diurnal wave of intensity is formed by pressure…

Astrophysics · Physics 2007-05-23 V. A. Kozyarivsky , A. S. Lidvansky , V. B. Petkov , T. I. Tulupova

Status of the EAS studies of cosmic rays with energy below 10**16 eV

This paper briefly summarizes the status of the cosmic ray observations by EAS (Extended Air Shower) experiments with energy below 10**16eV and the related studies of the hadronic interaction models. Based on the observed sharp knee…

High Energy Astrophysical Phenomena · Physics 2009-11-17 Hongbo Hu

Measurement of the fluctuations in the number of muons in extensive air showers with the Pierre Auger Observatory

We present the first measurement of the fluctuations in the number of muons in extensive air showers produced by ultrahigh energy cosmic rays. We find that the measured fluctuations are in good agreement with predictions from air shower…

High Energy Physics - Experiment · Physics 2021-04-28 The Pierre Auger Collaboration , A. Aab , P. Abreu , M. Aglietta , J. M. Albury , I. Allekotte , A. Almela , J. Alvarez-Muñiz , R. Alves Batista , G. A. Anastasi , L. Anchordoqui , B. Andrada , S. Andringa , C. Aramo , P. R. Araújo Ferreira , H. Asorey , P. Assis , G. Avila , A. M. Badescu , A. Bakalova , A. Balaceanu , F. Barbato , R. J. Barreira Luz , K. H. Becker , J. A. Bellido , C. Berat , M. E. Bertaina , X. Bertou , P. L. Biermann , T. Bister , J. Biteau , J. Blazek , C. Bleve , M. Boháčová , D. Boncioli , C. Bonifazi , L. Bonneau Arbeletche , N. Borodai , A. M. Botti , J. Brack , T. Bretz , F. L. Briechle , P. Buchholz , A. Bueno , S. Buitink , M. Buscemi , K. S. Caballero-Mora , L. Caccianiga , A. Cancio , F. Canfora , I. Caracas , J. M. Carceller , R. Caruso , A. Castellina , F. Catalani , G. Cataldi , L. Cazon , M. Cerda , J. A. Chinellato , K. Choi , J. Chudoba , L. Chytka , R. W. Clay , A. C. Cobos Cerutti , R. Colalillo , A. Coleman , M. R. Coluccia , R. Conceição , A. Condorelli , G. Consolati , F. Contreras , F. Convenga , C. E. Covault , S. Dasso , K. Daumiller , B. R. Dawson , J. A. Day , R. M. de Almeida , J. de Jesús , S. J. de Jong , G. De Mauro , J. R. T. de Mello Neto , I. De Mitri , J. de Oliveira , D. de Oliveira Franco , V. de Souza , E. De Vito , J. Debatin , M. del Río , O. Deligny , H. Dembinski , N. Dhital , A. Di Matteo , C. Dobrigkeit , J. C. D'Olivo , R. C. dos Anjos , M. T. Dova , J. Ebr , R. Engel , I. Epicoco , M. Erdmann , C. O. Escobar , A. Etchegoyen , H. Falcke , J. Farmer , G. Farrar , A. C. Fauth , N. Fazzini , F. Feldbusch , F. Fenu , B. Fick , J. M. Figueira , A. Filipčič , T. Fodran , M. M. Freire , T. Fujii , A. Fuster , C. Galea , C. Galelli , B. García , A. L. Garcia Vegas , H. Gemmeke , F. Gesualdi , A. Gherghel-Lascu , P. L. Ghia , U. Giaccari , M. Giammarchi , M. Giller , J. Glombitza , F. Gobbi , F. Gollan , G. Golup , M. Gómez Berisso , P. F. Gómez Vitale , J. P. Gongora , N. González , I. Goos , D. Góra , A. Gorgi , M. Gottowik , T. D. Grubb , F. Guarino , G. P. Guedes , E. Guido , S. Hahn , R. Halliday , M. R. Hampel , P. Hansen , D. Harari , V. M. Harvey , A. Haungs , T. Hebbeker , D. Heck , G. C. Hill , C. Hojvat , J. R. Hörandel , P. Horvath , M. Hrabovský , T. Huege , J. Hulsman , A. Insolia , P. G. Isar , J. A. Johnsen , J. Jurysek , A. Kääpä , K. H. Kampert , B. Keilhauer , J. Kemp , H. O. Klages , M. Kleifges , J. Kleinfeller , M. Köpke , G. Kukec Mezek , B. L. Lago , D. LaHurd , R. G. Lang , N. Langner , M. A. Leigui de Oliveira , V. Lenok , A. Letessier-Selvon , I. Lhenry-Yvon , D. Lo Presti , L. Lopes , R. López , R. Lorek , Q. Luce , A. Lucero , J. P. Lundquist , A. Machado Payeras , G. Mancarella , D. Mandat , B. C. Manning , J. Manshanden , P. Mantsch , S. Marafico , A. G. Mariazzi , I. C. Mariş , G. Marsella , D. Martello , H. Martinez , O. Martínez Bravo , M. Mastrodicasa , H. J. Mathes , J. Matthews , G. Matthiae , E. Mayotte , P. O. Mazur , G. Medina-Tanco , D. Melo , A. Menshikov , K. -D. Merenda , S. Michal , M. I. Micheletti , L. Miramonti , S. Mollerach , F. Montanet , C. Morello , M. Mostafá , A. L. Müller , M. A. Muller , K. Mulrey , R. Mussa , M. Muzio , W. M. Namasaka , L. Nellen , M. Niculescu-Oglinzanu , M. Niechciol , D. Nitz , D. Nosek , V. Novotny , L. Nožka , A Nucita , L. A. Núñez , M. Palatka , J. Pallotta , P. Papenbreer , G. Parente , A. Parra , M. Pech , F. Pedreira , J. Pękala , R. Pelayo , J. Peña-Rodriguez , J. Perez Armand , M. Perlin , L. Perrone , S. Petrera , T. Pierog , M. Pimenta , V. Pirronello , M. Platino , B. Pont , M. Pothast , P. Privitera , M. Prouza , A. Puyleart , S. Querchfeld , J. Rautenberg , D. Ravignani , M. Reininghaus , J. Ridky , F. Riehn , M. Risse , P. Ristori , V. Rizi , W. Rodrigues de Carvalho , J. Rodriguez Rojo , M. J. Roncoroni , M. Roth , E. Roulet , A. C. Rovero , P. Ruehl , S. J. Saffi , A. Saftoiu , F. Salamida , H. Salazar , G. Salina , J. D. Sanabria Gomez , F. Sánchez , E. M. Santos , E. Santos , F. Sarazin , R. Sarmento , C. Sarmiento-Cano , R. Sato , P. Savina , C. M. Schäfer , V. Scherini , H. Schieler , M. Schimassek , M. Schimp , F. Schlüter , D. Schmidt , O. Scholten , P. Schovánek , F. G. Schröder , S. Schröder , J. Schulte , S. J. Sciutto , M. Scornavacche , R. C. Shellard , G. Sigl , G. Silli , O. Sima , R. Šmída , P. Sommers , J. F. Soriano , J. Souchard , R. Squartini , M. Stadelmaier , D. Stanca , S. Stanič , J. Stasielak , P. Stassi , A. Streich , M. Suárez-Durán , T. Sudholz , T. Suomijärvi , A. D. Supanitsky , J. Šupík , Z. Szadkowski , A. Taboada , A. Tapia , C. Timmermans , O. Tkachenko , P. Tobiska , C. J. Todero Peixoto , B. Tomé , G. Torralba Elipe , A. Travaini , P. Travnicek , C. Trimarelli , M. Trini , M. Tueros , R. Ulrich , M. Unger , L. Vaclavek , M. Vacula , J. F. Valdés Galicia , I. Valiño , L. Valore , E. Varela , V. Varma K. C. , A. Vásquez-Ramírez , D. Veberič , C. Ventura , I. D. Vergara Quispe , V. Verzi , J. Vicha , J. Vink , S. Vorobiov , H. Wahlberg , A. A. Watson , M. Weber , A. Weindl , L. Wiencke , H. Wilczyński , T. Winchen , M. Wirtz , D. Wittkowski , B. Wundheiler , A. Yushkov , O. Zapparrata , E. Zas , D. Zavrtanik , M. Zavrtanik , L. Zehrer , A. Zepeda

Ultra High Energy Cosmic Ray Source Models: Successes, Challenges and General Predictions

Understanding the acceleration of Ultra High Energy Cosmic Rays is one of the great challenges of contemporary astrophysics. In this short review, we summarize the general observational constraints on their composition, spectrum and…

High Energy Astrophysical Phenomena · Physics 2023-05-24 Noemie Globus , Roger Blandford

Simulation and Parameterization of Longitudinal Development in Extensive Air Showers for Different Hadronic Interaction Models

The simulation analysis of the Extensive Air Showers (EAS) was executed by exploring the longitudinal development employing the AIRES system (version 19.04.00) for several hadronic interaction models (SIBYLL, QGSJET, and EPOS) for high…

High Energy Physics - Experiment · Physics 2022-02-21 Kadhom F. Fadhel , A. A. Al-Rubaiee

A New Approach to Mass Measurements of UHECR: Horizontal Air Showers

The role of Horizontal Showers induced by cosmic rays is discussed in detail. A new approach to the calculation of the muon component in horizontal air showers induced by protons, heavier nuclei or photons is presented which allows a simple…

Astrophysics · Physics 2009-10-31 Enrique Zas

Coherent Radiation from Extensive Air Showers in the Ultra-High Frequency Band

Using detailed Monte Carlo simulations we have characterized the features of the radio emission of inclined air showers in the Ultra-High Frequency band (300 MHz - 3 GHz). The Fourier-spectrum of the radiation is shown to have a sizable…

High Energy Astrophysical Phenomena · Physics 2013-10-09 Jaime Alvarez-Muñiz , Washington R. Carvalho , Andrés Romero-Wolf , Matías Tueros , Enrique Zas

Multiple Production, Transport in Atmosphere and Detection of High Energy Cosmic Rays

We describe the general aspects of Monte Carlo Collision Generators suitable for cosmic ray nucleon-Air and nuclei-Air interactions, including accelerator and collider data. The problem of the extrapolation at 3 energy decades above the LHC…

High Energy Physics - Phenomenology · Physics 2017-08-23 Jean-Noël Capdevielle , Fabrice Cohen , Corentin Le Gall

On the measurement of the proton-air cross section using cosmic ray data

Cosmic ray data may allow the determination of the proton-air cross section at ultra-high energy. For example, the distribution of the first interaction point in air showers reflects the particle production cross section. As it is not…

Astrophysics · Physics 2007-09-11 Ralf Ulrich , Johannes Bluemer , Ralph Engel , Fabian Schuessler , Michael Unger

A comprehensive study of shower to shower fluctuations

By means of Monte Carlo simulations of extensive air showers (EAS), we have performed a comprehensive study of the shower to shower fluctuations affecting the longitudinal and lateral development of EAS. We split the fluctuations into…

High Energy Astrophysical Phenomena · Physics 2011-02-03 P. M. Hansen , J. Alvarez-Muniz , R. A. Vazquez

Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory

The Pierre Auger Observatory has been collecting data in a stable manner since January 2004. We present here a study of the cosmic ray composition using events recorded in hybrid mode during the first years of data taking. These are air…

Astrophysics · Physics 2019-08-13 Michael Unger

Investigating double bump air showers with the SKA-Low

Double-bump showers are a rare class of extensive air showers (EAS) predicted by Monte Carlo simulations. They occur when a high-energy secondary particle, the leading particle, travels significantly farther than the rest, creating a…

High Energy Astrophysical Phenomena · Physics 2025-10-16 V. De Henau , S. Bouma , J. Bray , S. Buitink , A. Corstanje , M. Desmet , E. Dickinson , L. van Dongen , B. Hare , H. He , J. R. Hörandel , T. Huege , C. W. James , M. Jetti , P. Laub , H. -J. Mathes , K. Mulrey , A. Nelles , O. Scholten , C. Sterpka , S. ter Veen , K. Terveer , P. Turekova , T. N. G. Trinh , S. Saha , S. Sharma , R. Spencer , D. Veberič , K. Watanabe , M. Waterson , C. Zhang , P. Zhang , Y. Zhang

Cosmic Ray Air Shower Characteristics in the Framework of the Parton-Based Gribov-Regge Model NEXUS

The purpose of this paper is twofold: first we want to introduce a new type of hadronic interaction model (NEXUS), which has a much more solid theoretical basis as, for example, presently used models like QGSJET and VENUS, and ensures…

High Energy Physics - Phenomenology · Physics 2009-10-31 G. Bossard , H. J. Drescher , N. N. Kalmykov , S. Ostapchenko , A. I. Pavlov , T. Pierog , E. A. Vishnevskaya , K. Werner

Sensitivity of the correlation between the depth of shower maximum and the muon shower size to the cosmic ray composition

The composition of ultra-high energy cosmic rays is an important issue in astroparticle physics research, and additional experimental results are required for further progress. Here we investigate what can be learned from the statistical…

High Energy Astrophysical Phenomena · Physics 2012-03-19 Patrick Younk , Markus Risse