Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method

BI Xiao-Jun; CHEN Tian-Lu; CHEN Wen-Yi

doi:10.1088/1674-1137/37/3/035001

Chinese Physics C> 2013, Vol. 37> Issue(3) : 035001 DOI: 10.1088/1674-1137/37/3/035001

Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method

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Abstract：
We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet Ⅲ air shower array data taken from November 1999 to December 2008. The statistics are twice the amount used in our previous paper. In this analysis, the amplitude of the observed sidereal time modulation is about 0.1%, and the modulation shows an excess from about 4 to 7 hours and a deficit around 12 hours in local sidereal time. The sidereal time modulation has a weak dependence on the primary energy of the cosmic rays. However, the solar time modulation shows a large energy dependence. We find that the solar time modulation is fairly consistent with the prediction of the Compton-Getting effect for high-energy samples (6.2 TeV and 12.0 TeV), but exceeds the prediction for the low-energy sample (4.0 TeV). Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.

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BI Xiao-Jun, CHEN Tian-Lu and CHEN Wen-Yi. Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method[J]. Chinese Physics C, 2013, 37(3): 035001. doi: 10.1088/1674-1137/37/3/035001

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Received: 2012-05-09
Revised: 2012-05-28

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method

Received Date: 2012-05-09

Accepted Date: 2012-05-28

Available Online: 2013-03-05

Abstract: We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet Ⅲ air shower array data taken from November 1999 to December 2008. The statistics are twice the amount used in our previous paper. In this analysis, the amplitude of the observed sidereal time modulation is about 0.1%, and the modulation shows an excess from about 4 to 7 hours and a deficit around 12 hours in local sidereal time. The sidereal time modulation has a weak dependence on the primary energy of the cosmic rays. However, the solar time modulation shows a large energy dependence. We find that the solar time modulation is fairly consistent with the prediction of the Compton-Getting effect for high-energy samples (6.2 TeV and 12.0 TeV), but exceeds the prediction for the low-energy sample (4.0 TeV). Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.

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Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method

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Updated study on multi-TeV cosmic-ray modulation with the Tibet Ⅲ air shower array using the east-west method

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