冲击下粒子加速的混合模拟

Damiano Caprioli
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引用次数: 13

摘要

我们给出了在非相对论性无碰撞冲击下粒子加速的大混合(动力学离子-流体电子)模拟结果。在马赫数高达100的激波中,离子加速效率和磁场放大作为激波倾斜度和强度的函数进行了详细研究,并与扩散激波加速理论的预测结果进行了比较。此外,我们还讨论了激波前驱中共振和贝尔不稳定性的相对重要性,并表明自生湍流中的扩散可以有效地参数化为放大磁场中的Bohm扩散。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hybrid Simulations of Particle Acceleration at Shocks

We present the results of large hybrid (kinetic ions – fluid electrons) simulations of particle acceleration at non-relativistic collisionless shocks. Ion acceleration efficiency and magnetic field amplification are investigated in detail as a function of shock inclination and strength, and compared with predictions of diffusive shock acceleration theory, for shocks with Mach number up to 100. Moreover, we discuss the relative importance of resonant and Bell's instability in the shock precursor, and show that diffusion in the self-generated turbulence can be effectively parametrized as Bohm diffusion in the amplified magnetic field.

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