Critical Self-Organization of Astrophysical Shocks
Critical Self-Organization of Astrophysical Shocks
复制标题
天体物理冲击的临界自组织
DOI：
10.1086/312622
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
H. Völk
中科院分区：
文献类型：
--
作者：
M. Malkov;P. Diamond;H. Völk
激波的一阶费米加速度有两种不同的形式。第一种是线性（测试粒子）状态，其中大部分激波能量进入等离子体的热和体运动。第二种是激波能量进入加速粒子的有效状态。虽然它们之间的过渡区域很窄，但我们确定了驱动系统走向这两个政权之间自组织临界状态的因素。我们用解析解确定了这一临界状态，并计算了加速粒子的光谱和最大能量。
There are two distinct regimes of the first-order Fermi acceleration of shocks. The first is a linear (test-particle) regime in which most of the shock energy goes into thermal and bulk motions of the plasma. The second is an efficient regime in which the shock energy goes into accelerated particles. Although the transition region between them is narrow, we identify the factors that drive the system toward a self-organized critical state between those two regimes. Using an analytic solution, we determine this critical state and calculate the spectra and maximum energy of accelerated particles.