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arXiv 2205.07366physics.space-phphysics.plasm-ph
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多电流片MHD尺度系统中的粒子加速

Particle acceleration in an MHD-scale system of multiple current sheets

M. Nakanotani, G. P. Zank, L. -L. Zhao

备注：
25 pages, 10 figures, to be submitted to frontiers
发表信息：
Frontiers in Astronomy and Space Sciences, 9 (2022)
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摘要：

我们研究粒子加速的MHD尺度系统的多个电流片进行二维和三维MHD模拟结合测试粒子模拟。该系统是不稳定的撕裂模不稳定性，和磁岛产生的磁重联。由于磁岛的相互作用，系统变成湍流状态。二维（三维）的情况下，产生两个$-5/3$（$-11/3$和$-7/3$）幂律空间的磁场和速度的波动。粒子被有效地激励所产生的湍流，它形成了一个幂律尾指数为$-2.2$和$-4.2$的能量分布函数的二维和三维的情况下，分别。我们在磁岛外发现了更多的高能粒子，而不是在磁岛内。在高能粒子的能量空间中，我们观察到了二维（$\sim t^{2.27}$）和三维（$\sim t^{1.2}$）情况下的超扩散。

英文摘要：

We investigate particle acceleration in an MHD-scale system of multiple current sheets by performing 2D and 3D MHD simulations combined with a test particle simulation. The system is unstable for the tearing-mode instability, and magnetic islands are produced by magnetic reconnection. Due to the interaction of magnetic islands, the system turns into a turbulent state. The 2D (3D) case yields both $-5/3$ ($-11/3$ and $-7/3$) power-law spacetra for magnetic and velocity fluctuations. Particles are efficiently energized by the generated turbulence, and it forms a power-law tail with an index of $-2.2$ and $-4.2$ in the energy distribution function for the 2D and 3D case, respectively. We find more energetic particles outside magnetic islands rather than inside. We observe super-diffusion in the 2D ($\sim t^{2.27}$) and 3D ($\sim t^{1.2}$) case in the energy space of energetic particles.

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