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,Y Katayose,H H He,X Y Zhang,Q X Geng,A Shiomi,M Takita,Zhaxisangzhu Zhaxisangzhu,S W Cui,Haibing Hu,H Sugimoto,M Sakata,Danzengluobu Danzengluobu,S Udo,J Mu,H Nanjo,M He,F Kajino,H Onuma,K Kawata,S Ayabe,K Hibino,N Hotta,S Yasue,M Shibata,X H Ding,A F Yuan,H Y Jia,M Ohnishi,T Shirai,T Yuda,Y Zhang,L K Ding,I Ohta,K Mizutani,N Tateyama,L Xue,S L Lu,X Y Gao,Labaciren Labaciren,K Kasahara,T Ouchi,Z Feng ,H M Zhang,S Ozawa,S Mori,X R Meng,C T Yan,Z H Ye,H Tsuchiya,Hongbo Hu ,T Saito,Y Yamamoto,Q Huang,N J Zhang,G C Yu,Masaki Nakamura ,H Lü ,H R Wu,J L Zhang,Yun Tan ,X X Zhou,H Wang,Y G Wang,H W Guo,Toshihiro Utsugi ,J Y Li,X C Yang,C Kato,X Wang,Shoji Torii ,K Munakata,J Huang,C Feng ,G M Le,J R Ren,Takashi Sasaki ,B S Wang

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.

M Amenomori, Y Katayose + Show 76 more

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https://doi.org/10.1103/physrevlett.93.061101

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#Solar Modulation Effect #Compton-Getting Anisotropy + Show 8 more

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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.

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