Evolution of the cosmic ray anisotropy above 10^{14} eV

Details Evolution of the cosmic ray anisotropy above 10^{14} eV Evolution of the cosmic ray anisotropy above 10^{14} eV

2009-01-18

arxiv.org/abs/0901.2740v1

Astrophys.J.Lett.692:L130-L133,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 3 figures, accepted for publication on ApJ Letters

Scientific paper

10.1088/0004-637X/692/2/L130

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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