EVOLUTION OF THE COSMIC-RAY ANISOTROPY ABOVE 1014 eV
EVOLUTION OF THE COSMIC-RAY ANISOTROPY ABOVE 1014 eV
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DOI：
10.1088/0004-637x/692/2/l130
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Aglietta;V. Alekseenko;B. Alessandro;P. Antonioli;F. Arneodo;L. Bergamasco;M. Bertaina;R. Bon
中科院分区：
文献类型：
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作者：
M. Aglietta;V. Alekseenko;B. Alessandro;P. Antonioli;F. Arneodo;L. Bergamasco;M. Bertaina;R. Bon
宇宙射线各向异性的振幅和相位在 1011 eV 和 1014 eV 之间通过实验得到了很好的确定。研究它们在 1014-1016 eV 能量区域的演化可以为理解主光谱的陡峭（“拐点”）提供重要工具。在这封信中，我们通过使用完整的数据集（八年的数据采集）将在 E0 ≈ 1014 eV 下进行的 EAS-TOP 测量扩展到更高的能量。对约 1014 eV 和 4 × 1014 eV 下得出的结果进行了比较和讨论。据报道，振幅增加和相位变化超过 1014 eV。讨论了该观测对于理解宇宙射线传播的意义。
The amplitude and phase of the cosmic-ray anisotropy are well established experimentally between 1011 eV and 1014 eV. The study of their evolution in the energy region 1014–1016 eV can provide a significant tool for the understanding of the steepening (“knee”) of the primary spectrum. In this Letter, we extend the EAS-TOP measurement performed at E0 ≈ 1014 eV to higher energies by using the full data set (eight years of data taking). Results derived at about 1014 and 4 × 1014 eV are compared and discussed. Hints of increasing amplitude and change of phase above 1014 eV are reported. The significance of the observation for the understanding of cosmic-ray propagation is discussed.