AI 中文总结
针对强引导场下传统粒子加速机制无法解释非热粒子分布的问题，研究提出粒子在电荷匮乏电流片中被加速，该电流速度近光速，相关分布服从对数正态统计，为非热粒子分布提供了新机制。
AI 中文摘要
磁主导的阿尔文湍流为粒子加速提供了有效环境，但当存在强平均场时，镜像加速、曲率加速等传统机制无法有效解释非热粒子能量分布。通过数值与唯象研究，我们提出在这类湍流中，粒子在电荷匮乏电流片中被加速，对应电流速度接近光速；电流分布、等离子体密度、电荷涨落及加速粒子的能量分布均近似服从对数正态统计，非热粒子分布源于电荷匮乏电流片中的粒子加速，而非湍流涡旋的传统费米型粒子加速。
英文摘要
Magnetically dominated Alfvénic turbulence creates an effective environment for particle acceleration. However, when a strong mean field is present, traditional mechanisms like mirror and curvature acceleration become inefficient at explaining non-thermal particle energy distributions. Based on numerical and phenomenological study, we propose that in such turbulence, particles are accelerated in charge-starved current sheets, corresponding to current velocities approaching the speed of light. The distributions of the electric currents, plasma density, fluctuations of electric charge, as well as the energy distributions of accelerated particles, approximately follow log-normal statistics. Non-thermal particle distributions thus arise from particle acceleration in these charge-starved current sheets rather than from conventional Fermi-type particle acceleration by turbulent eddies.
Comments8 pages, 5 figures
