Investigation of Energy- and Rigidity-Dependent Anisotropy with IceTop

This study examines the energy dependence of cosmic-ray anisotropy using data collected by the IceTop air shower array at the South Pole from 2011 to 2022. The dataset was divided into four energy tiers—310 TeV, 1.1 PeV, 2.4 PeV, and 6.6 PeV—based on the number of stations triggered, with corrections applied for snow accumulation that gradually lowered reconstructed energies over time. Anisotropy maps were generated in sidereal and antisidereal time frames to identify possible systematic effects. In addition, rigidity, defined as energy scaled by the atomic charge number, was calculated for 2012 simulation data to support comparison between the surface IceTop and in-ice IceCube detectors. The goal of this analysis is to investigate the discrepancy observed between the two detectors hypothesized to arise from their differing sensitivities to primary particles of varying charge.