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Anisotropies at Ultra High Energies and the Galactic Halo

A measure of consistency is appearing in measurements of the anisotropy of arrival directions above 10 eV and these show a Galactic Plane Enhancement and a S-N excess, to about 3.10 eV. The implication is that Galactic particles predominate here. At higher energies, where an Extragalactic origin is preferred, a contender for the ‘sources’ is exotic dark matter particles. However, an analysis of the anisotropy at the highest energies, or, rather, the lack of it, makes this interpretation highly unlikely. Instead, ‘bottom-up’ acceleration, in galaxy-systems is preferred; the likely mass mixture of the primaries, above 10 eV, helps to explain why strong clustering of arrival is not observed.