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ARGO-YBJ OBSERVATION OF THE LARGE-SCALE COSMIC RAY ANISOTROPY DURING THE SOLAR MINIMUM BETWEEN CYCLES 23 AND 24
ARGO-YBJ Collaboration
2015
发表期刊ASTROPHYSICAL JOURNAL
卷号809期号:1页码:90
摘要This paper reports on the measurement of the large-scale anisotropy in the distribution of cosmic-ray arrival directions using the data collected by the air shower detector ARGO-YBJ from 2008 January to 2009 December, during the minimum of solar activity between cycles 23 and 24. In this period, more than 2 x 10(11) showers were recorded with energies between similar to 1 and 30 TeV. The observed two-dimensional distribution of cosmic rays is characterized by two wide regions of excess and deficit, respectively, both of relative intensity similar to 10(-3) with respect to a uniform flux, superimposed on smaller size structures. The harmonic analysis shows that the large-scale cosmic-ray relative intensity as a function of R.A. can be described by the first and second terms of a Fouries series. The high event statistics allow the study of the energy dependence of the anistropy, showing that the amplitude increases with energy, with a maximum intensity at similar to 10 TeV, and then decreases while the phase slowly shifts toward lower values of R.A. with increasing energy. The ARGO-YBJ data provide accurate observations over more than a decade of energy around this feature of the anisotropy spectrum.
文章类型Article
关键词cosmic rays methods: data analysis methods: observational
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/809/1/90
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000361653500090
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被引频次:13[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228716
专题粒子天体物理中心
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ARGO-YBJ Collaboration. ARGO-YBJ OBSERVATION OF THE LARGE-SCALE COSMIC RAY ANISOTROPY DURING THE SOLAR MINIMUM BETWEEN CYCLES 23 AND 24[J]. ASTROPHYSICAL JOURNAL,2015,809(1):90.
APA ARGO-YBJ Collaboration.(2015).ARGO-YBJ OBSERVATION OF THE LARGE-SCALE COSMIC RAY ANISOTROPY DURING THE SOLAR MINIMUM BETWEEN CYCLES 23 AND 24.ASTROPHYSICAL JOURNAL,809(1),90.
MLA ARGO-YBJ Collaboration."ARGO-YBJ OBSERVATION OF THE LARGE-SCALE COSMIC RAY ANISOTROPY DURING THE SOLAR MINIMUM BETWEEN CYCLES 23 AND 24".ASTROPHYSICAL JOURNAL 809.1(2015):90.
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