Shinshu Univ, Fac Sci, Dept Phys, Matsumoto, Nagano 3908621, Japan
; Hirosaki Univ, Dept Phys, Hirosaki, Aomori 036, Japan
; Saitama Univ, Dept Phys, Urawa, Saitama 338, Japan
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
; Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 221, Japan
; Utsunomiya Univ, Fac Educ, Utsunomiya, Tochigi 321, Japan
; Univ Tokyo, Inst Cosm Ray Res, Tanashi, Tokyo 188, Japan
; SW Jiaotong Univ, Dept Phys, Chengdu 610031, Peoples R China
; Konan Univ, Dept Phys, Kobe, Hyogo 658, Japan
; Shibaura Inst Technol, Fac Syst Engn, Omiya, Saitama 330, Japan
; Tibet Univ, Dept Math & Phys, Lhasa 850000, Peoples R China
; Inst Phys & Chem Res, Wako, Saitama 35101, Japan
; Yunnan Univ, Dept Phys, Kunming 650091, Peoples R China
; Natl Ctr Sci Informat Syst, Tokyo 112, Japan
; Tokyo Metropolitan Coll Aernaut Engn, Tokyo 116, Japan
; Yokohama Natl Univ, Fac Educ, Yokohama, Kanagawa 240, Japan
; Shonan Inst Technol, Fujisawa, Kanagawa 251, Japan
; Shandong Univ, Dept Phys, Jinan 250100, Peoples R China
Article; Proceedings Paper
We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower(AS) array in one year from January to December 1992. The Tibet AS array can detect the incident direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the incident direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (similar to 0.5%) which is common for the viewing directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data. (C)1999 COSPAR. Published by Elsevier Science Ltd.
Munakata, K,Hara, T,Yasue, S,et al. Sidereal daily variation of similar to 10 TeV cosmic-ray intensity observed by the Tibet air shower array[J]. TRANSPORT OF GALACTIC AND ANOMALOUS COSMIC RAYS IN THE HELIOSPHERE: OBSERVATIONS, SIMULATIONS AND THEORY,1999,23(3):599-602.
Munakata, K.,Hara, T.,Yasue, S.,Kato, C.,Hall, DL.,...&任敬儒.(1999).Sidereal daily variation of similar to 10 TeV cosmic-ray intensity observed by the Tibet air shower array.TRANSPORT OF GALACTIC AND ANOMALOUS COSMIC RAYS IN THE HELIOSPHERE: OBSERVATIONS, SIMULATIONS AND THEORY,23(3),599-602.
Munakata, K,et al."Sidereal daily variation of similar to 10 TeV cosmic-ray intensity observed by the Tibet air shower array".TRANSPORT OF GALACTIC AND ANOMALOUS COSMIC RAYS IN THE HELIOSPHERE: OBSERVATIONS, SIMULATIONS AND THEORY 23.3(1999):599-602.