Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.3919m&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
We analyze the sidereal daily variation (SDV) of galactic cosmic-ray intensity observed by the Tibet II airshower array during 29 months between October 1995 and August 1999. The high-count observations help us analyze the SDV with a great significance. We found that the magnitude of the observed SDV shows a significant seasonal change (1 cycle/year) with an amplitude exceeding 50% of the average SDV. This seasonal change in magnitude produces spurious solar (365 cycle/year) and extended sidereal (367 cycle/year) daily variations at sideband frequencies of the SDV (366 cycle/year). The observed solar daily variation corrected for this effect is consistent with the variation expected from the ComptonGetting anisotropy due to the earth's revolution around the sun. The extended sidereal daily variation observed is also consistent with the variation expected from the seasonal change of the SDV. The phase of maximum (minimum) SDV in March (September) suggests the influence of the large-scale solar magnetic field on the propagation of charged particles in the heliosphere. We discuss on such effect by comparing the observed SDV with that reproduced from the calculation of cosmic-ray orbits in a model heliosphere.
Amenomori Michihiro
Ayabe S.
Cui Shu-Wen
Ding Lin-Kai
Ding Xue-Yong
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