Dependence of the Energy Spectrum of UHE Cosmic Rays on the Latitude of an Extensive Air Shower Array

Several energy spectra of cosmic rays with energies E_0 geq 10^17 eV measured at the Yakutsk EAS, AGASA, Haverah Park, HiRes, Auger, and SUGAR arrays are considered. It is shown that the fairly good mutual agreement of the spectrum shapes can be achieved if the energy of each spectrum is multiplied by a factor K specific for each spectrum. These factors exhibit a pronounced dependence on the latitude of the above-mentioned arrays.

Anisotropy of Arrival Directions of E0 > 8 x 10**18 eV Cosmic Rays and Cosmic Microwave Background

Results are presented that were obtained by analysing the arrival directions of E0 > 8x10**18 eV primary cosmic rays recorded at the Yakutsk array over the period between 1974 and 2003 and at the SUGAR array (Australia). The greatest primary cosmic ray flux is shown to arrive from the region of visible intersection of the planes of the Galaxy and the Supergalaxy (local supercluster of galaxies) at a galactic longitude of about 137 degres. On a global scale, the lowest temperature of the cosmic microwave background is typical of this region.

On the Anisotropy of E0 >= 5.5$times$1019 eV Cosmic Rays according to Data of the Pierre Auger Collaboration

The Pierre Auger Collaboration discovered, in a solid angle of radius about 18degree, a local group of cosmic rays having energies in the region E0 geq 5.5times1019 eV and coming from the region of the Gen A radio galaxy, whose galactic coordinates are lG = 309.5degree and bG = 19.4degree. Near it, there is the Centaur supercluster of galaxies, its galactic coordinates being lG = 302.4degree and bG = 21.6degree. It is noteworthy that the Great Attractor, which may have a direct bearing on the observed picture, is also there.