Year: 2025
Type: conference-paper
Abstract: Current observations of the two-dimensional (2D) anisotropy of cosmic rays in the GeV-PeV energy remain inadequate. In the TeV-PeV energy, ground-based experiments can only precisely measure the anisotropy along the right ascension (RA) direction within individual declination(DEC) bands; the precision across different DEC bands is insufficient for precise measurements. In the GeV-TeV energy, space-based experiments provide only upper limits. For ground-based array, Earth's rotation causes the detectors to sweep uniformly across DEC bands, ensuring consistent detection efficiency across RA directions. This enables high-precision measurement of the relative intensity variation in RA directions. However, no analogous natural scanning mechanism exists for the DEC direction. To address this limitation, this paper proposes a novel rotating ground-based array scheme. By rotating the detector array, the RA scanning principle is extended to cover the full two-dimensional RA-Dec plane, enabling true-2D anisotropy measurement. This approach simultaneously allows for precise determination of the array's detection efficiency for cosmic rays arriving from different directions. Notably, space-based experiments inherently function as rotating platforms. Therefore, the analysis methods developed in this study are expected to be directly applicable to satellite data.
DOI: 10.22323/1.501.0317
Authors: Dan Li, Wei Liu, Dongxu Sun, hongbo HU
Institutions: Chinese Academy of Sciences, Institute of High Energy Physics
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4414437774
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