Study of Parallel Shock Acceleration, the Bend-over Energy of Spectrum of Charged Energetic Particles
arXiv: High Energy Astrophysical Phenomena(2017)
摘要
Shock acceleration is considered one of the most important mechanisms of astrophysical energetic particlesu0027 acceleration. In this work, we calculate large amount of test charged particlesu0027 trajectories accurately in a parallel shock with magnetic turbulence. We investigate energetic particlesu0027 acceleration mechanisms by calculating particlesu0027 energy and flux evolution with time. From simulations we obtain double power-law energy spectra with the bend-over energy increasing as a function of time. With the mean accelerating time and averaged momentum change during each cycle of particles crossing of shock from diffusive shock acceleration model, a time differential equation for the maximum of shock accelerated energy $E_{acc}$ can be approximately obtained following Drury. We assume the bend-over energy as $E_{acc}$. It is found that the model of the bend-over energy generally agrees with the simulations, and that the bend-over energy model with our non-linear diffusion theory, NLGCE-F, performs better than that with the classic quasi-linear theory, QLT.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络