Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-10
Phys.Rev.Lett.93:061101,2004
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, includes .bbl file
Scientific paper
10.1103/PhysRevLett.93.061101
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.
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