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首页> 外文期刊>The Astrophysical journal >SUPERDIFFUSIVE AND SUBDIFFUSIVE TRANSPORT OF ENERGETIC PARTICLES IN SOLAR WIND ANISOTROPIC MAGNETIC TURBULENCE
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SUPERDIFFUSIVE AND SUBDIFFUSIVE TRANSPORT OF ENERGETIC PARTICLES IN SOLAR WIND ANISOTROPIC MAGNETIC TURBULENCE

机译:太阳风各向异性磁湍动中能量粒子的超扩散与亚扩散传输

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摘要

The transport of energetic particles in a mean magnetic field and the presence of anisotropic magnetic turbulence are studied numerically, for parameter values relevant to the solar wind. A numerical realization of magnetic turbulence is set up in which we can vary the type of anisotropy by changing the correlation lengths l_x, l_y, l_z. We find that for l_x, l_y > > l_z, transport can be non-Gaussian, with superdiffusion along the average magnetic field and subdiffusion perpendicular to it. Decreasing the l_x/l_z ratio down to approx < 0.3, Gaussian diffusion is obtained, showing that the transport regime depends on the turbulence anisotropy. Implications for energetic particle propagation in the solar wind and for diffusive shock acceleration are discussed.
机译:对于与太阳风有关的参数值,通过数值研究了高能粒子在平均磁场中的传输和各向异性磁湍流的存在。建立了磁湍流的数值实现,其中我们可以通过改变相关长度l_x,l_y,l_z来改变各向异性的类型。我们发现,对于l_x,l_y l_z,传输可以是非高斯的,沿着平均磁场具有超级扩散,垂直于它的子扩散。将l_x / l_z比率降低到大约<0.3,可获得高斯扩散,表明传输方式取决于湍流各向异性。讨论了高能粒子在太阳风中的传播以及扩散性冲击加速度的影响。

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