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arXiv 1702.06193astro-ph.HEastro-ph.GA
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间歇磁场中的宇宙射线

Cosmic Rays in Intermittent Magnetic Fields

Anvar Shukurov, Andrew Snodin, Amit Seta, Paul Bushby, Toby Wood

摘要:

宇宙射线在湍流磁场中的传播是一个由随机磁场涨落引起的带电粒子散射驱动的扩散过程。这种磁场通常是高度间歇性的,由强烈的磁丝和磁带组成,周围环绕着较弱的非结构化波动。对宇宙射线传播的研究在很大程度上忽略了非线性,而是依赖于高斯随机磁场。使用测试粒子模拟,我们调查宇宙射线在间歇性,发电机产生的磁场扩散。结果进行了比较,从非间歇性磁场具有相同的功率谱。磁不透性的存在显著增强了宇宙射线在广泛粒子能量范围内的扩散。我们证明,结果可以解释相关的随机游走。

英文摘要:

The propagation of cosmic rays in turbulent magnetic fields is a diffusive process driven by the scattering of the charged particles by random magnetic fluctuations. Such fields are usually highly intermittent, consisting of intense magnetic filaments and ribbons surrounded by weaker, unstructured fluctuations. Studies of cosmic ray propagation have largely overlooked intermittency, instead relying on Gaussian random magnetic fields. Using test particle simulations, we investigate cosmic ray diffusivity in intermittent, dynamo-generated magnetic fields. The results are compared with those obtained from non-intermittent magnetic fields having identical power spectra. The presence of magnetic intermittency significantly enhances cosmic ray diffusion over a wide range of particle energies. We demonstrate that the results can be interpreted in terms of a correlated random walk.

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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