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

We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet 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 tim...

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Published inChinese physics C Vol. 37; no. 3; pp. 53 - 57
Main Author 李爱凤 毕效军 陈天禄 陈文益 崔树旺 单增罗布 丁林恺 丁晓红 冯存峰 冯朝阳 冯振勇 苟全补 郭宏伟 郭义庆 何会海 侯正涛 胡海冰 胡红波 黄晶 李万杰 贾焕玉 姜龙 康明铭 乐贵明 雷文华 厉海金 刘成 刘金胜 刘茂元 卢红 孟宪茹 钱祥利 曲晓波 谭有恒 王辉 吴含荣 沈长铨 沈培若 薛良 杨振 袁爱芳 翟留名 张慧敏 张吉龙 张学尧 张勇 张毅 张颖 周勋秀
Format Journal Article
LanguageEnglish
Published 01.03.2013
Subjects
Air showers
Arrays
Cosmic rays
Modulation
Samples
Sidereal time
Statistical analysis
TeV
Tibet
太阳能
宇宙射线
恒星时
时间调制
西藏
阵列
风淋
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Summary:We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet 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 （6.2TeV and 12.0TeV）, but exceeds the prediction for the low-energy sample （4.0TeV）. Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.
Bibliography:11-5641/O4
cosmic-ray anisotropy, Compton-Getting effect, east-west method
We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet 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 （6.2TeV and 12.0TeV）, but exceeds the prediction for the low-energy sample （4.0TeV）. Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.
LI Ai-Feng BI Xiao-Jun CHEN Tian-Lu CHEN Wen-Yi CUI Shu-Wang DANZENGLUOBU DING Lin-Zai DING Xiao-Hong FENG Cun-Feng FENG Zhao-Yang FENG Zhen-Yong GOU Quan-Bu GUO Hong-Wei GUO Yi-Qing HE Hui-Hai HOW Zheng-Tao HU Hai-Bing HU Hong-Bo HUANG Jing LI Wan-Jie JIA Huan-Yu JIANG Long KANG Ming-Ming LE Gui-Ming LEI Wen-Hua LI Hai-Jin LIU Cheng LIU Jin-Sheng LIU Mao-Yuan LU Hong MENG Xian-Ru QIAN Xiang-Li QU Xiao-Bo TAN You-Heng WANG Hui WU Han-Rong SHEN Chang-Quan SHEN Pei-Ruo XUE Liang YANG Zhen YUAN Ai-Fang ZHAI Liu-Ming ZHANG Hui-Min ZHANG Ji-Long ZHANG Xue-Yao ZHANG Yong ZHANG Yi ZHANG Ying ZHOU Xun-Xiu Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 2 Tibet University, Lhasa 850000, China 3 Hebei Normal University, Shijiazhuang 050016, China 4 Shandong University, Jinan 250100, China 5 Southwest Jiaotong University, Chengdu 610031, China 6 Shandong Agricultural University Taian 271018, China
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/37/3/035001