Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2021
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| _version_ | 1866917599676203008 |
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| author | Li, Ai-feng Yuan, Qiang Liu, Wei Guo, Yi-qing |
| author_facet | Li, Ai-feng Yuan, Qiang Liu, Wei Guo, Yi-qing |
| contents | Recent studies have shown that the anisotropy is of great value to decipher cosmic rays' origin and propagation. We have built an unified scenario to describe the observations of the energy spectra and the large-scale anisotropy and called attention to their synchronously evolution with energy. In this work, the impact of of the local regular magnetic field (LRMF) and corresponding anisotropic diffusion on large-scale anisotropy have been investigated. When the perpendicular diffusion coefficient is much smaller than the parallel one, the dipole anisotropy points to the LRMF and the observational phase below $100$ TeV could be reproduced. Moreover we find that the dipole phase above $100$ TeV strongly depends on the evolution of local diffusion. But the current measurements at that energy are still scarce. We suggest that more precise measurements at that energy could be carried out to unveil the local diffusion and further the local turbulence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2107_00313 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation Li, Ai-feng Yuan, Qiang Liu, Wei Guo, Yi-qing High Energy Astrophysical Phenomena Recent studies have shown that the anisotropy is of great value to decipher cosmic rays' origin and propagation. We have built an unified scenario to describe the observations of the energy spectra and the large-scale anisotropy and called attention to their synchronously evolution with energy. In this work, the impact of of the local regular magnetic field (LRMF) and corresponding anisotropic diffusion on large-scale anisotropy have been investigated. When the perpendicular diffusion coefficient is much smaller than the parallel one, the dipole anisotropy points to the LRMF and the observational phase below $100$ TeV could be reproduced. Moreover we find that the dipole phase above $100$ TeV strongly depends on the evolution of local diffusion. But the current measurements at that energy are still scarce. We suggest that more precise measurements at that energy could be carried out to unveil the local diffusion and further the local turbulence. |
| title | Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2107.00313 |