Observation by an air-shower array in Tibet of the multi-TeV cosmic-ray anisotropy due to terrestrial orbital motion around the Sun

M Amenomori; S Ayabe; S W Cui; Danzengluobu; L K Ding; X H Ding; C F Feng; Z Y Feng; X Y Gao; Q X Geng; H W Guo; H H He; M He; K Hibino; N Hotta; Haibing Hu; H B Hu; J Huang; Q Huang; H Y Jia; F Kajino; K Kasahara; Y Katayose; C Kato; K Kawata; Labaciren; G M Le; J Y Li; H Lu; S L Lu; X R Meng; K Mizutani; S Mori; J Mu; K Munakata; H Nanjo; M Nishizawa; M Ohnishi; I Ohta; H Onuma; T Ouchi; S Ozawa; J R Ren; T Saito; M Sakata; T Sasaki; M Shibata; A Shiomi; T Shirai; H Sugimoto; M Takita; Y H Tan; N Tateyama; S Torii; H Tsuchiya; S Udo; T Utsugi; B S Wang; H Wang; X 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; Zhaxisangzhu; X X Zhou; Tibet ASgamma Collaboration

doi:10.1103/PhysRevLett.93.061101

Observation by an air-shower array in Tibet of the multi-TeV cosmic-ray anisotropy due to terrestrial orbital motion around the Sun

Phys Rev Lett. 2004 Aug 6;93(6):061101. doi: 10.1103/PhysRevLett.93.061101. Epub 2004 Aug 5.

Authors

M Amenomori¹, S Ayabe, S W Cui, Danzengluobu, L K Ding, X H Ding, C F Feng, Z Y Feng, X Y Gao, Q X Geng, H W Guo, H H He, M He, K Hibino, N Hotta, Haibing Hu, H B Hu, J Huang, Q Huang, H Y Jia, F Kajino, K Kasahara, Y Katayose, C Kato, K Kawata, Labaciren, G M Le, J Y Li, H Lu, S L Lu, X R Meng, K Mizutani, S Mori, J Mu, K Munakata, H Nanjo, M Nishizawa, M Ohnishi, I Ohta, H Onuma, T Ouchi, S Ozawa, J R Ren, T Saito, M Sakata, T Sasaki, M Shibata, A Shiomi, T Shirai, H Sugimoto, M Takita, Y H Tan, N Tateyama, S Torii, H Tsuchiya, S Udo, T Utsugi, B S Wang, H Wang, X 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, Zhaxisangzhu, X X Zhou; Tibet ASgamma Collaboration

Affiliation

¹ Department of Physics, Hirosaki University, 036-8561, Japan.

PMID: 15323615
DOI: 10.1103/PhysRevLett.93.061101

Abstract

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 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.