论文标题
非热颗粒加速度在磁重新连接中的效率
Efficiency of Nonthermal Particle Acceleration in Magnetic Reconnection
论文作者
论文摘要
在磁重新连接期间的非热粒子加速度仍然是几种天体物理现象中的基本话题，例如太阳耀斑，脉冲风，磁铁，磁铁等，持续了半个多世纪，而未解决的问题之一是其效率。最近，通过粒子中的粒子模拟对重新连接期间的非热粒子加速度机制进行了广泛的研究，但是对于如何将磁场能如何分为热加热的等离子体和非热颗粒，这是一个有趣的谜。在这里，我们使用大规模的粒子仿真来研究对血浆的非相对论和相对论磁重连接，并表明非热粒子的产生随着等离子体温度的升高而有效。在相对论的热等离子体案例中，我们确定通过重新连接加热的等离子体可以通过KAPPA分布函数近似，其KAPPA指数约为3或更少（相当于幂律指数为2或更少），而重新连接的非热能密度大约超过95％的总内部能量。
The nonthermal particle acceleration during magnetic reconnection remains a fundamental topic in several astrophysical phenomena, such as solar flares, pulsar wind, magnetars, etc, for more than half a century, and one of the unresolved questions is its efficiency. Recently, nonthermal particle acceleration mechanisms during reconnection have been extensively studied by particle-in-cell simulations, yet it is an intriguing enigma as to how the magnetic field energy is divided into thermally heated plasmas and nonthermal particles. Here we study both non-relativistic and relativistic magnetic reconnections using large-scale particle-in-cell simulation for a pair plasma, and indicate that the production of the nonthermal particle becomes efficient with increasing the plasma temperature. In the relativistic hot plasma case, we determine that the heated plasmas by reconnection can be approximated by a kappa distribution function with the kappa index of approximately 3 or less (equivalent to 2 or less for the power-law index), and the nonthermal energy density of reconnection is approximately over 95% of the total internal energy in the downstream exhaust.
