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27 April 2024

» pubmed » pmid15323615

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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 ; ;
Date:	6 Aug 2004
Journal:	Phys Rev Lett, 93 (6), 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.
Source:	PubMed, pmid15323615
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