Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.3961m&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
We examine the galactic cosmic-ray anisotropy by analyzing the sidereal daily variation (SDV) of ˜10TeV cosmic-ray intensity observed by the Tibet I I and Tibet I I I air shower arrays, during total 49 months between 1997 and 2001. It is found that the spurious variation in the extended-sidereal time (367c/y) becomes insignificant when the non-uniformity in the observation period is properly taken into account in the analysis. The SDV (366c/y) with ˜0.1% amplitude, on the other hand, remains significant in a good agreement with the result by the Mt.Norikura air shower experiment. The daily variation in the solar time (365c/y) also becomes quite consistent with the Compton-Getting anisotropy due to the earth's revolution around the sun. This is the most accurate result of the anisotropy ever reported in this energy region.
Amenomori Michihiro
Ayabe S.
Cui Shu-Wen
Danzengluobu
Ding Lin-Kai
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