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The Pierre Auger Observatory has recently reported the detection of a dipoleanisotropy in the arrival directions of cosmic rays above 8 EeV with apost-trial significance of more than 5.2$\sigma$. This observation has profoundconsequences for the distribution and composition of candidate sources ofcosmic rays above the ankle (3-5 EeV). In this paper we search for the presenceof anisotropies on all angular scales in public Auger data. The analysisfollows a likelihood-based reconstruction method that automatically accountsfor variations in the observatory's angular acceptance and background rate. Ourbest-fit dipole anisotropy in the equatorial plane has an amplitude of 5.3$\pm$ 1.3 percent and right ascension angle of 103 $\pm$ 15 degrees, consistentwith the results of the Pierre Auger Collaboration. We do not find evidence forthe presence of medium- or small-scale anisotropies. The method outlined inthis paper is well-suited for the future analyses of cosmic ray anisotropiesbelow the ankle, where cosmic ray detection in surface arrays is not fullyefficient and dominated by systematic uncertainties.

Searching for All-Scale Anisotropies in the Arrival Directions of Cosmic Rays above the Ankle