发表机构
Center for Integrated Plasma Studies, Department of Physics, 390 UCB, University of Colorado, Boulder, CO 80309-0390, USA（科罗拉多大学博尔德分校等离子体综合研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究推导了湍流中重联电流片系综注入非热粒子的幂律谱指数公式，并基于数值结果预测谱指数范围，解释了射电与离子谱特征。
AI 中文摘要
经历强亚阿尔芬湍流的无碰撞低β等离子体，预期会在强导向磁场中形成宽层级结构的一系列重联电流片。若电流片的重联场强度与其长度按指数为κ的幂律标度，且单位长度区间内电流片数量按指数为x的幂律递减，则该电流片系综注入的非热粒子能量谱呈幂律形式，正比于γ^{-s}，其中s = 1 + (x-2)/(1 + κ)。当最长的电流片贡献大部分注入能量时，谱变硬（s < 2），这要求x < 3 + κ。过往数值研究测得2 ≲ x ≲ 3.3，而强电流片的标度关系支持κ ≳ 0，从而得到1 ≲ s ≲ 2.3。这种注入机制可能在光学薄源中产生平坦或略陡的射电谱，并在活动星系核冕中产生硬的离子谱。
英文摘要
A collisionless, low-$β$ plasma undergoing strong sub-Alfvénic turbulence is expected to form a broad hierarchy of reconnecting current sheets immersed in a strong guide magnetic field. If the reconnecting field strength of a sheet scales with its length as a power law of index $κ$, and the number of sheets per unit interval of sheet length decreases as a power law of index $x$, the current-sheet ensemble injects nonthermal particles with a power-law energy spectrum $\propto γ^{-s}$, where $s = 1 + (x-2)/(1 + κ)$. The spectrum is hard ($s < 2$) when the longest sheets deliver most of the injected energy, which requires $x < 3 + κ$. Past numerical studies have measured $2 \lesssim x \lesssim 3.3$, and the scalings of intense current sheets support $κ\gtrsim 0$, resulting in $1 \lesssim s \lesssim 2.3$. This injection may yield flat or mildly steep radio spectra in optically thin sources and hard ion spectra in the coronae of active galactic nuclei.
Comments9 pages, 3 figures
