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arXiv 1111.2536astro-ph.HE
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局部磁Turbulence和TeV-PeV Cosmic Ray各向异性

Local Magnetic Turbulence and TeV-PeV Cosmic Ray Anisotropies

G. Giacinti, G. Sigl

摘要:

在~ 10^12 eV到~ 10^15 eV的能量范围内,银河宇宙线通量在大尺度上具有各向异性,振幅约为0.1%,在~ 10度到~ 30度之间的尺度上,振幅小了几倍。从银河系宇宙射线化学丰度推断的扩散系数,扩散近似预测的偶极各向异性的大小相当,但不能解释较小规模的各向异性。我们在这里证明,能量依赖的小尺度各向异性自然产生的湍流磁场内的宇宙射线散射长度的本地具体实现。我们展示了如何计算这样的各向异性,如果磁场结构在几十秒差距从地球已知。

英文摘要:

In the energy range from ~ 10^12 eV to ~ 10^15 eV, the Galactic cosmic ray flux has anisotropies both on large scales, with an amplitude of the order of 0.1%, and on scales between ~ 10 and ~ 30 degrees, with amplitudes smaller by a factor of a few. With a diffusion coefficient inferred from Galactic cosmic ray chemical abundances, the diffusion approximation predicts a dipolar anisotropy of comparable size, but does not explain the smaller scale anisotropies. We demonstrate here that energy dependent smaller scale anisotropies naturally arise from the local concrete realization of the turbulent magnetic field within the cosmic ray scattering length. We show how such anisotropies could be calculated if the magnetic field structure within a few tens of parsecs from Earth were known.

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