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.
Categories: astro-ph.HE