On the Solar Cycle Variation of the Solar Diurnal Anisotropy of Multi-TeV Cosmic-ray Intensity Observed with the Tibet Air Shower Array

On the Solar Cycle Variation of the Solar Diurnal Anisotropy of Multi-TeV Cosmic-ray Intensity Observed with the Tibet Air Shower Array
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西藏空气簇射阵观测的多TeV宇宙线强度太阳日各向异性的太阳周期变化

DOI：
10.1051/epjconf/201920808012
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发表时间：
2019-05
期刊：
The European Physical Journal, conf.
影响因子：
--
通讯作者：
Y. Kat
Y. Kat
中科院分区：
其他
文献类型：
--
作者：
M. Amenomori;X. J. Bi;D. Chen;T. L. Chen;W. Y. Chen;S. W. Cui;Danzengluobu;L. K. Ding;C. F. Feng;Zhaoyang Feng;Z. Y. Feng;Q. B. Gou;Y. Q. Guo;H. H. He;Z. T. He;K. Hibino;N. Hotta;Haibing Hu;H. B. Hu;J. Huang;H. Y. Jia;L. Jiang;F. Kajino;K. Kasahara;Y. Kat

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分析了2000 - 2009年西藏空气簇射阵观测到的多TeV宇宙线强度的日各向异性随时间的变化，涵盖了第23太阳活动周的最大值和最小值。我们确认，一个显着的附加各向异性分量叠加在Compton-Getting各向异性在4.0 TeV，而它的振幅在较高的能量区域减小。除了Matsushiro实验报道的0.6 TeV的额外各向异性外，我们发现Tibet在多TeV能量下测量的剩余分量与稳定一致，具有相当恒定的振幅0.041% ± 0.003%，相位在4.0 TeV的07.17 ± 00.16当地太阳时附近。这表明西藏实验观察到的额外各向异性可能是由与太阳活动无关的机制造成的。
We analyze the temporal variation of the solar diurnal anisotropy of the multi-TeV cosmic-ray intensity observed with the Tibet air shower array from 2000 to 2009, covering the maximum and minimum of the 23rd solar cycle. We comfirm that a remarkable additional anisotropy component is superposed on the Compton-Getting anisotropy at 4.0 TeV, while its amplitude decreases at higher energy regions. In constrast to the additional anisotropy reported by the Matsushiro experiment at 0.6 TeV, we find the residual component measured by Tibet at multi-TeV energies is consistent with being stable, with a fairly constant amplitude of 0.041% ± 0.003% and a phase at around 07.17 ± 00.16 local solar time at 4.0 TeV. This suggests the additional anisotropy observed by the Tibet experiment could result from mechanisms unrelated to solar activities.
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