范忠辉1，， 刘四明2，
（ 1、云南大学物理科学技术学院,昆明 650091 ； 2、中国科学院紫金山天文台,南京 210008； ）
摘要： 在许多天体系统中,带电粒子与等离子体波相互作用的随机加速可能产生超热粒子。这个过程可在能量空间中用Fokker-Planck方程来描述扩散过程。在本文中,针对扩散系数的普遍形式,我们用时间依赖的数值程序来解简化的只涉及时间和能量变量的Fokker-Planck方程。在Sedov膨胀相中的粒子加速,我们用自相似模型,并用TeV超新星遗迹RX J1713.7-3946作为例子来证明我们的模型特征,并通过观测数据,用马尔科夫链蒙特卡洛方法来约束模型参数。
关键词： 粒子加速：MHD：等离子体：激波：湍流
Fan Zhonghui1,， Liu Siming2,
（ 1、Department of Physics, University of Yunnang, Kunming 510091 ； 2、Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008； ）
Abstract： Stochastic acceleration of charged particles due to their interactions with plasma waves may be responsible for producing superthermal particles in a variety of astrophysical systems. This process can be described as a diffusion process in the energy space with the Fokker-Planck equation. In this paper, a time-dependent numerical code is used to solve the reduced Fokker-Planck equation involving only time and energy variables with general forms of the diffusion coefficients. We also propose a self-similar model for particle acceleration in Sedov explosions and use the TeV SNR RX J1713.7-3946 as an example to demonstrate the model characteristics. Markov Chain Monte Carlo method is utilized to constrain model parameters with observations.
Keywords： acceleration of particles: MHD: plasmas: shock waves: turbulence
