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首页> 外文期刊>Plasma physics and controlled fusion >Simulation results on the influence of magneto-hydrodynamic waves on cosmic ray particles
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Simulation results on the influence of magneto-hydrodynamic waves on cosmic ray particles

机译：磁流体动力波对宇宙射线粒子影响的模拟结果

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摘要

The problem of cosmic ray scattering in magnetohydrodynamic turbulence is revisited using a recently developed Monte Carlo simulation code. Diffusion coefficients are obtained using magnetostatic turbulence, slab Alfv′enic turbulence with and without electric fields and isotropic magnetosonic turbulence with and without electric fields. All non-magnetostatic simulations are carried out for different values of the Alfven velocity so that the effects of different particle to Alfven velocity ratios can be studied. For slab turbulence, it is shown that Alfven waves guarantee the recovery of diffusion, as predicted by analytical studies. The inclusion of electric fields, however, immediately leads to superdiffusion, if the Alfv′en velocity is not too small. Furthermore, the energy gain through stochastic acceleration processes is investigated both qualitatively and quantitatively. The comparison with previous simulation reveals both similarities and interesting differences.
机译：使用最近开发的蒙特卡洛模拟代码，重新探讨了磁流体动力湍流中宇宙射线的散射问题。使用静磁场湍流，平板在电场作用下和不作用电场下的Alfv'enic湍流以及在电场作用下和不作用电场下的各向同性磁声湍流来获得扩散系数。对Alfven速度的不同值执行所有非静磁模拟，以便可以研究不同粒子与Alfven速度比的影响。对于平板湍流，表明Alfven波可以保证扩散的恢复，正如分析研究所预测的那样。但是，如果Alfv'en速度不太小，则电场的包含会立即导致超扩散。此外，定性和定量地研究了通过随机加速过程获得的能量。与先前模拟的比较揭示了相似性和有趣的差异。

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