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Observation of Cosmic-Ray Anisotropy in the Southern Hemisphere with 12 yr of Data Collected by the IceCube Neutrino Observatory
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-3350-390x
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-0602-9472
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Number of Authors: 4372025 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 981, no 2, article id 182Article in journal (Refereed) Published
Abstract [en]

We analyzed the 7.92 x 10(11) cosmic-ray-induced muon events collected by the IceCube Neutrino Observatory from 2011 May 13, when the fully constructed experiment started to take data, to 2023 May 12. This data set provides an up-to-date cosmic-ray arrival direction distribution in the Southern Hemisphere with unprecedented statistical accuracy covering more than a full period length of a solar cycle. Improvements in Monte Carlo event simulation and better handling of year-to-year differences in data processing significantly reduce systematic uncertainties below the level of statistical fluctuations compared to the previously published results. We confirm the observation of a change in the angular structure of the cosmic-ray anisotropy between 10 TeV and 1 PeV, more specifically in the 100-300 TeV energy range. For the first time, we analyzed the angular power spectrum at different energies. The observed variations of the power spectra with energy suggest relatively reduced large-scale features at high energy compared to those of medium and small scales. The large volume of data enhances the statistical significance at higher energies, up to the PeV scale, and smaller angular scales, down to approximately 6 degrees compared to previous findings.

Place, publisher, year, edition, pages
2025. Vol. 981, no 2, article id 182
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-247804DOI: 10.3847/1538-4357/adb1deISI: 001449301000001OAI: oai:DiVA.org:su-247804DiVA, id: diva2:2008208
Available from: 2025-10-22 Created: 2025-10-22 Last updated: 2025-10-22Bibliographically approved

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Finley, ChadHidvegi, AttilaHultqvist, KlasNeste, LudwigWalck, Christian

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