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arXiv 1407.0850astro-ph.HEhep-ph
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磁场和TeV能量下的cosmic ray各向异性

Magnetic fields and cosmic ray anisotropies at TeV energies

Eduardo Battaner, Joaquin Castellano, Manuel Masip

摘要:

几个宇宙射线观测站提供了TeV-PeV能量的高精度天空图。数据显示,O(0.1%)赤字从北银河系的方向,峰值在10 TeV,然后与其他各向异性在较小的角尺度的能量一起演变。使用玻尔兹曼方程,我们推导出宇宙射线通量的表达式,适合大多数这些功能。各向异性取决于本地星际磁场B_{IS},在我们附近的平均银河场B_{R},并对占主导地位的宇宙射线源的分布。我们发现,沿B_{IS}的初始偶极子各向异性可以调制的变化,在全球宇宙线风,偶极子方向的变化将意味着一个给定的半径的相干B_{IS}。我们还表明,中小规模的各向异性可能会出现时,全天空各向异性发现作为磁透镜的湍流。

英文摘要:

Several cosmic-ray observatories have provided a high accuracy map of the sky at TeV--PeV energies. The data reveals an O(0.1%) deficit from north galactic directions that peaks at 10 TeV and then evolves with the energy, together with other anisotropies at smaller angular scales. Using Boltzmann's equation we derive expressions for the cosmic-ray flux that fit most of these features. The anisotropies depend on the local interstellar magnetic field B_{IS}, on the average galactic field B_{R} in our vicinity, and on the distribution of dominant cosmic-ray sources. We show that the initial dipole anisotropy along B_{IS} can be modulated by changes in the global cosmic ray wind, and that a variation in the dipole direction would imply a given radius of coherence for B_{IS}. We also show that small and medium-scale anisotropies may appear when the full-sky anisotropy finds a turbulence acting as a magnetic lens.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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