论文标题
在多个电流板的MHD尺度系统中的粒子加速度
Particle acceleration in an MHD-scale system of multiple current sheets
论文作者
论文摘要
我们通过执行2D和3D MHD模拟与测试粒子模拟的2D和3D MHD模拟，研究了多个电流表的MHD尺度系统中的粒子加速度。该系统对于撕裂模式不稳定性不稳定，磁岛是通过磁重新连接产生的。由于磁岛的相互作用，系统变成了湍流状态。 2D（3D）案例同时产生$ -5/3 $（$ -11/3 $和$ -7/3 $）的磁性和速度波动的幂律Spacetra。颗粒通过产生的湍流有效地启动，并且在2D和3D情况下，它的能量分布函数分别形成了幂律尾部，其索引分别为$ -2.2 $和$ -4.2 $。我们发现磁岛外的更多能量颗粒而不是内部。我们在2D（$ \ sim t^{2.27} $）和3D（$ \ sim t^{1.2} $）的情况下观察到超扩散，在能量粒子的能量空间中。
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.
