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
Full text: pdf
Pre-published on: August 17, 2023
Published on:
Abstract
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
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.