An enhanced equi-zenith angle method is developed that measures cosmic-ray anisotropies over multiple time frames while determining detection efficiency directly from the data.
Discovery of Localized Regions of Excess 10-TeV Cosmic Rays
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abstract
An analysis of 7 years of Milagro data performed on a 10-degree angular scale has found two localized regions of excess of unknown origin with greater than 12 sigma significance. Both regions are inconsistent with gamma-ray emission with high confidence. One of the regions has a different energy spectrum than the isotropic cosmic-ray flux at a level of 4.6 sigma, and it is consistent with hard spectrum protons with an exponential cutoff, with the most significant excess at ~10 TeV. Potential causes of these excesses are explored, but no compelling explanations are found.
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Enhanced All-Distance Equi-Zenith Angle Method for Cosmic-Ray Anisotropy Measurement
An enhanced equi-zenith angle method is developed that measures cosmic-ray anisotropies over multiple time frames while determining detection efficiency directly from the data.