论文标题
加速度和能量颗粒逃脱对冲击时光谱陡峭的影响
Effect of acceleration and escape of energetic particles on spectral steepening at shocks
论文作者
论文摘要
行星际冲击的能量颗粒光谱通常在较高的能量下狭窄的动量范围内表现出功率定律。我们引入了一个粒子加速度的传输方程，并通过接近冲击的自我产生的湍流和远上山的湍流来促进颗粒加速度和逃生。与扩散的冲击加速度滚动相比，上游粒子强度从冲击的扩散长度内陡峭。由宏观参数控制的动量光谱，例如冲击压缩，速度，上游扩散系数和冲击时的逃生时间，也可以减少到对数旁皮以及损坏的功率定律。在上游均匀扩散系数的情况下，检索了很大程度上使用的功率定律/指数切割溶液。
Energetic particles spectra at interplanetary shocks often exhibit a power law within a narrow momentum range softening at higher energy. We introduce a transport equation accounting for particle acceleration and escape with diffusion contributed by self-generated turbulence close to the shock and by pre-existing turbulence far upstream. The upstream particle intensity steepens within one diffusion length from the shock as compared with diffusive shock acceleration rollover. The momentum spectrum, controlled by macroscopic parameters such as shock compression, speed, far upstream diffusion coefficient and escape time at the shock, can be reduced to a log-parabola and also to a broken power law. In the case of upstream uniform diffusion coefficient, the largely used power law/exponential cut off solution is retrieved.
