Testing for uniformity of Ultra-High Energy Cosmic Ray arrival directions
A.A. Ivanov
TL;DR
This study tests the uniformity of ultra-high energy cosmic ray arrival directions and finds no significant deviations from isotropy in the Yakutsk array data from 1974 to 2000.
Contribution
It applies two methods to analyze circular uniformity in cosmic ray arrival directions across different energy ranges, providing a comprehensive test for anisotropy.
Findings
No significant deviation from uniformity detected
Supports isotropic distribution of cosmic rays at observed energies
Validates previous assumptions of isotropy in cosmic ray arrival directions
Abstract
Arrival directions of ultra-high energy cosmic rays (UHECRs) exhibit mainly an isotropic distribution with some small deviations in particular energy bins. In this paper, the Yakutsk array data are tested for circular uniformity of arrival directions in right ascension using 2 methods appropriate for the energy ranges below and above eV. No statistically significant deviation from uniformity is found in the arrival directions of cosmic rays (CRs) detected within the observation period 1974--2000.
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