On Temporal Variations of the Multi-TeV Cosmic Ray Anisotropy using the Tibet III Air Shower Array

M. Amenomori,X. J. Bi,D. Chen,S. W. Cui,Danzengluobu,L. K. Ding,X. H. Ding,C. Fan,C. F. Feng,Zhaoyang Feng,Z. Y. Feng,X. Y. Gao,Q. X. Geng,Q. B. Gou,H. W. Guo,H. H. He,M. He,K. Hibino,N. Hotta,Haibing Hu,H. B. Hu,J. Huang,Q. Huang,H. Y. Jia,L. Jiang,F. Kajino,K. Kasahara,Y. Katayose,C. Kato,K. Kawata, Labaciren,G. M. Le,A. F. Li,H. C. Li,J. Y. Li,C. Liu,Y.-Q. Lou,H. Lu,X. R. Meng,K. Mizutani,J. Mu,K. Munakata,A. Nagai,H. Nanjo,M. Nishizawa,M. Ohnishi,I. Ohta,S. Ozawa,T. Saito,T. Y. Saito,M. Sakata,T. K. Sako,M. Shibata,A. Shiomi,T. Shirai,H. Sugimoto,M. Takita,Y. H. Tan,N. Tateyama,S. Torii,H. Tsuchiya,S. Udo,B. Wang,H. Wang,Y. Wang,Y. G. Wang,H. R. Wu,L. Xue,Y. Yamamoto,C. T. Yan,X. C. Yang,S. Yasue,Z. H. Ye,G. C. Yu,A. F. Yuan,T. Yuda,H. M. Zhang,J. L. Zhang,N. J. Zhang,X. Y. Zhang,Y. Zhang,Yi Zhang,Ying Zhang,Zhaxisangzhu,X. X. Zhou

ASTROPHYSICAL JOURNAL（2011）

Cited 43|Views57

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Abstract

We analyze the large-scale two-dimensional sidereal anisotropy of multi-TeV cosmic rays (CRs) by the Tibet Air Shower Array, with the data taken from 1999 November to 2008 December. To explore temporal variations of the anisotropy, the data set is divided into nine intervals, each with a time span of about one year. The sidereal anisotropy of magnitude, about 0.1%, appears fairly stable from year to year over the entire observation period of nine years. This indicates that the anisotropy of TeV Galactic CRs remains insensitive to solar activities since the observation period covers more than half of the 23rd solar cycle.

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Key words

cosmic rays,diffusion,ISM: magnetic fields,solar neighborhood,Sun: activity

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