The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014-1016 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 ≈ 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 eV are compared and discussed. Hints of increasing amplitude and change of phase above 1014 eV are reported. The significance of the observation for the understanding of cosmic-ray propagation is discussed.

M., A., V. V., A., B., A., P., A., F., A., L., B., et al. (2009). EVOLUTION OF THE COSMIC-RAY ANISOTROPY ABOVE 1014eV. THE ASTROPHYSICAL JOURNAL, 692, L130-L133 [10.1088/0004-637X/692/2/L130].

EVOLUTION OF THE COSMIC-RAY ANISOTROPY ABOVE 1014eV

STAMERRA, ANTONIO;
2009

Abstract

The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014-1016 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 ≈ 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 eV are compared and discussed. Hints of increasing amplitude and change of phase above 1014 eV are reported. The significance of the observation for the understanding of cosmic-ray propagation is discussed.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/41447
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