Measurements of cosmic-ray anisotropy using LHAASO-WCDA
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September 24, 2025
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Abstract
The cosmic-ray anisotropy is now used to help unveil nearby cosmic-ray accelerators and their local propagation environment. The LHAASO-WCDA experiment is composed of three water ponds. It covers a total detection area of 87000 ${\rm m}^2$, which makes it an ideal detector for measuring the cosmic-ray anisotropy from hundreds of GeV to $\sim$ PeV. In this talk, we present the measurements of the cosmic-ray anisotropies using two years of WCDA data. We extended our measurement to the lower energy, about 600 GeV. We find a significant energy dependence of the dipole component of the sidereal-time anisotropy below several TeV. Meanwhile, we also find the remarkable influence of solar activities on the solar-time anisotropy at sub-TeV.
DOI: https://doi.org/10.22323/1.501.0320
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.