PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Measurement of cosmic-ray anisotropies using LHAASO-WCDA
W. Liu*, D.x. Sun, D. Li, H.b. Hu, Q. Yuan and Y.Q. Guo
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Pre-published on: August 17, 2023
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The theoretical investigations have affirmed that the cosmic-ray (CR) anisotropy could help unveil the cosmic-ray origin, propagation and the local interstellar environment. Their precise measurements have been paid more and more attention in the recent years. As one of three principal facilities of the Large High Altitude Air Shower Observatory (LHAASO), the water Cherenkov detector array (WCDA) is composed of three water ponds and covers a total detection area of $87000$ m$^2$. This makes it an ideal candidate for measuring the CR anisotropy from sub-TeV to $\sim $ PeV. Since March 2021, WCDA has been in full operation with three ponds. In this contribution, we present the preliminary measurements of the CR anisotropy from $\sim 1$ TeV to $\sim 150$ TeV using two years of data, which contains $\sim 230$ billion events. The check of the analysis method have been done in anti-sidereal and extended-sidereal time frames, and the fluctuations in both frames are found to be small. The Compton-Getting effect in the solar time have been detected in the different energy bins. In terms of the above checks, the energy dependence of the CR anisotropy in the sidereal time are measured.
DOI: https://doi.org/10.22323/1.444.0186
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