Observation by an air-shower array in Tibet of the multi-TeV cosmic-ray anisotropy due to terrestrial orbital motion around the Sun
Aug, 20044 pages
Published in:
- Phys.Rev.Lett. 93 (2004) 061101
e-Print:
- astro-ph/0408187 [astro-ph]
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Abstract: (arXiv)
We report on the solar diurnal variation of the galactic cosmic-ray intensity observed by the Tibet III air shower array during the period from 1999 to 2003. In the higher-energy event samples (12 TeV and 6.2 TeV), the variations are fairly consistent with the Compton-Getting anisotropy due to the terrestrial orbital motion around the sun, while the variation in the lower-energy event sample (4.0 TeV) is inconsistent with this anisotropy. This suggests an additional anisotropy superposed at the multi-TeV energies, e.g. the solar modulation effect. This is the highest-precision measurement of the Compton-Getting anisotropy ever made.Note:
- 4 pages, 2 figures, includes .bbl file Journal-ref: Physical Review Letters, volume 93, issue 6, (2004) 061101 DOI: 10.1103/PhysRevLett.93.061101
- 96.40.Pq
- 96.40.Kk
- 96.50.Bh
- showers: air
- cosmic radiation: anisotropy
- orbit: solar
- time dependence
- scintillation counter
- shower detector: experimental results
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