Jul 12 – 23, 2021
Europe/Berlin timezone

Observation of large-scale anisotropy in the arrival directions of cosmic rays with LHAASO

Jul 15, 2021, 12:00 PM
1h 30m


Talk CRI | Cosmic Ray Indirect Discussion


Dr Wei Gao (Shandong University)


A global large-scale anisotropy in the arrival directions of cosmic rays were observed both in the Northern and Southern Hemisphere. Above 100 TeV, change in the morphology of the arrival direction distribution is appeared. However, most reports of anisotropy are from TeV to hundred TeV and only a few experiments can up to PeV with long term data accumulation. The measurement of anisotropy at high energies are need to enrich and provide more clues to the origin and propagation of cosmic rays. The Large High Altitude Air Shower Observatory (LHAASO), covering an area of 1.36 sq.km., could detect cosmic rays from hundred GeV up to 100 PeV with good element discrimination ability. In this paper, data collected by WCDA during 2019 and KM2A during 2020 are used to analyze the large-scale anisotropy. The anisoptropies in a very wide energy range from TeV up to PeV are reported and the results are compared with others. With the operation of LHAASO, more accurate observation for the cosmic-ray anisotropy at higher energy will be made.


large-scale anisotropy, LHAASO, cosmic ray

Subcategory Experimental Results
Collaboration Lhaaso

Primary author

Dr Wei Gao (Shandong University)


for the LHAASO Collaboration Prof. Chengguang Zhu (Shandong University) Dr Hengying Zhang (Shandong University) Prof. Huihai He (IHEP) Ms Qing Cao (Hebei Normal University) Dr Sha Wu (IHEP) Prof. Shuwang Cui (Hebei Normal University) Dr Songzhan Chen (IHEP) Dr Wenlong Li (Shandong University)

Presentation materials