Evolution of the cosmic ray anisotropy above 10^{14} eV
M. Aglietta, V.V. Alekseenko, B. Alessandro, P. Antonioli, F. Arneodo,, L. Bergamasco, M. Bertaina, R. Bonino, A. Castellina, A. Chiavassa, B., D'Ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P.L. Ghia, M., Iacovacci, G. Mannocchi, C. Morello, G. Navarra
TL;DR
This paper investigates how the anisotropy of cosmic rays evolves above 10^{14} eV, providing insights into cosmic ray propagation and the spectral knee through extended measurements up to 4x10^{14} eV.
Contribution
It extends previous measurements of cosmic ray anisotropy to higher energies using 8 years of data, revealing potential increases in anisotropy amplitude and phase changes.
Findings
Hints of increasing anisotropy amplitude above 10^{14} eV
Observed phase change in cosmic ray anisotropy
Comparison of anisotropy at 10^{14} eV and 4x10^{14} eV
Abstract
The amplitude and phase of the cosmic ray anisotropy are well established experimentally between 10^{11} eV and 10^{14} eV. The study of their evolution into the energy region 10^{14}-10^{16} eV can provide a significant tool for the understanding of the steepening ("knee") of the primary spectrum. In this letter we extend the EAS-TOP measurement performed at E_0 around 10^{14} eV, to higher energies by using the full data set (8 years of data taking). Results derived at about 10^{14} and 4x10^{14} eV are compared and discussed. Hints of increasing amplitude and change of phase above 10^{14} eV are reported. The significance of the observation for the understanding of cosmic ray propagation is discussed.
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