ar X iv : 0 90 1 . 27 40 v 1 [ as tr o - ph . H E ] 1 8 Ja n 20 09 Evolution of the cosmic ray anisotropy above 10 14 eV
نویسندگان
چکیده
The amplitude and phase of the cosmic ray anisotropy are well established experimentally between 10 eV and 10 eV. The study of their evolution into the energy region 10 − 10 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 E0 ≈ 10 14 eV, to higher energies by using the full data set (8 years of data taking). Results derived at about 10 and 4 · 10 eV are compared and discussed. Hints of increasing amplitude and change of phase above 10 eV are reported. The significance of the observation for the understanding of cosmic ray propagation is discussed. Subject headings: Cosmic rays, diffusion
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