论文标题
电阻电场对重新连接层中颗粒加速的影响
The impact of resistive electric fields on particle acceleration in reconnection layers
论文作者
论文摘要
在具有磁重新连接的高能天体物理环境中粒子加速的背景下，与对流相比，电场电阻术语的重要性仍在争论中。在这项工作中，我们通过2D磁性流动动力学数值模拟进行定量分析，该数值模拟与pluto代码一起执行的测试粒子方法耦合的撕裂不稳定的电流板。我们发现电阻场在高能颗粒的早期能量中起着重要作用。实际上，这些颗粒在电阻电场上越过X点时首先加速，这是在当前纸的碎片过程中产生的。如果忽略了以电阻场为主的这种初步粒子加速机制，则颗粒将无法达到相同的高能量。因此，我们的结果支持了一个结论，即电阻场不仅不可忽略，而且实际上确实在粒子加速机制中起着重要作用。
In the context of particle acceleration in high-energy astrophysical environments featuring magnetic reconnection, the importance of the resistive term of the electric field compared to the convective one is still under debate. In this work, we present a quantitative analysis through 2D magnetohydrodynamic numerical simulations of tearing-unstable current sheets coupled to a test-particles approach, performed with the PLUTO code. We find that the resistive field plays a significant role in the early-stage energization of high-energy particles. Indeed, these particles are firstly accelerated due to the resistive electric field when they cross an X-point, created during the fragmentation of the current sheet. If this preliminary particle acceleration mechanism dominated by the resistive field is neglected, particles cannot reach the same high energies. Our results support therefore the conclusion that the resistive field is not only non-negligible but it does actually play an important role in the particle acceleration mechanism.
