Study of Time Evolution of the Bend-over Energy in the Energetic Particle Spectrum at a Parallel Shock

doi:10.3847/1538-4357/ab1b33

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	Study of Time Evolution of the Bend-over Energy in the Energetic Particle Spectrum at a Parallel Shock
	Kong,F.-J.1; Qin,G.1; Wu,S.-S.1; Zhang,L.-H.2; Wang,H.-N.2; Chen,T.3; Sun,P.4
刊名	The Astrophysical Journal
	2019-05-29
卷号	877 期号:2
关键词	acceleration of particles diffusion shock waves Sun: coronal mass ejections (CMEs) Sun: particle emission turbulence
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1b33
英文摘要	Abstract Shock acceleration is considered one of the most important mechanisms for the acceleration of astrophysical energetic particles. In this work, we calculate the trajectories of a large number of test charged particles accurately in a parallel shock with magnetic turbulence. We investigate the time evolution of the accelerated particle energy spectrum in the downstream of the shock, in order to understand the acceleration mechanism of energetic particles. From simulation results we obtain power-law energy spectra with a bend-over energy, E0, increasing with time. With the particle mean acceleration time and mean momentum change during each cycle of the shock crossing from the diffusive shock acceleration model (following Drury), a time-dependent differential equation for the maximum energy, Eacc, of particles accelerated at the shock can be approximately obtained. We assume the theoretical bend-over energy as Eacc. It is found that the bend-over energy from simulations agrees well with the theoretical bend-over energy using the nonlinear diffusion theory, NLGCE-F, in contrast to that using the classic quasi-linear theory.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-877-2-AB1B33
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26439]
专题	中国科学院国家天文台
作者单位	1.School of Science, Harbin Institute of Technology, Shenzhen, 518055, People’s Republic of China; qingang@hit.edu.cn 2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China 3.State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China 4.Department of Planetary Sciences and Astronomy, University of Arizona, Tucson, AZ 85721, USA
推荐引用方式 GB/T 7714	Kong,F.-J.,Qin,G.,Wu,S.-S.,et al. Study of Time Evolution of the Bend-over Energy in the Energetic Particle Spectrum at a Parallel Shock[J]. The Astrophysical Journal,2019,877(2).
APA	Kong,F.-J..,Qin,G..,Wu,S.-S..,Zhang,L.-H..,Wang,H.-N..,...&Sun,P..(2019).Study of Time Evolution of the Bend-over Energy in the Energetic Particle Spectrum at a Parallel Shock.The Astrophysical Journal,877(2).
MLA	Kong,F.-J.,et al."Study of Time Evolution of the Bend-over Energy in the Energetic Particle Spectrum at a Parallel Shock".The Astrophysical Journal 877.2(2019).