A Global MHD Simulation of Outer Heliosphere Including Anomalous Cosmic-Rays

doi:10.3847/1538-4357/ab262b

	A Global MHD Simulation of Outer Heliosphere Including Anomalous Cosmic-Rays
	Guo, Xiaocheng; Florinski, Vladimir; Wang, Chi
刊名	ASTROPHYSICAL JOURNAL
	2019
卷号	879 期号:2 页码:87
关键词	cosmic rays diffusion magnetohydrodynamics (MHD) methods: numerical plasmas Sun: heliosphere
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab262b
英文摘要	A global MHD-neutrals-cosmic-rays simulation is conducted to investigate the effects of anomalous cosmic-rays (ACRs) on the large-scale structure of the outer heliosphere. In the model, the cosmic-rays are treated as a massless fluid that only contribute their pressure to the dynamics of the system. The diffusion of cosmic-rays in the interstellar medium is assumed to be much faster than inside the heliosphere, where it depends on the strength of the magnetic field. The results show that the influence of the cosmic-rays on the structure of the outer heliosphere depends on momentum and energy transfer from the solar wind plasma to the ACRs, accomplished through diffusive shock acceleration at the termination shock, and the subsequent loss of ACRs across the heliopause and their rapid escape into the interstellar medium. Under favorable conditions characterized by a large fraction of energy conversion and a high enough diffusion coefficient in the solar wind, the ACRs were found to reduce the width of the heliosheath by up to similar to 18 au. Consequently, these results indicate that the effect of cosmic-rays is a potential key factor for the global structure of the outer heliosphere in a computer model that could partially explain the timing of the heliopause encounters of the two Voyager probes.
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/7061]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Guo, Xiaocheng,Florinski, Vladimir,Wang, Chi. A Global MHD Simulation of Outer Heliosphere Including Anomalous Cosmic-Rays[J]. ASTROPHYSICAL JOURNAL,2019,879(2):87.
APA	Guo, Xiaocheng,Florinski, Vladimir,&Wang, Chi.(2019).A Global MHD Simulation of Outer Heliosphere Including Anomalous Cosmic-Rays.ASTROPHYSICAL JOURNAL,879(2),87.
MLA	Guo, Xiaocheng,et al."A Global MHD Simulation of Outer Heliosphere Including Anomalous Cosmic-Rays".ASTROPHYSICAL JOURNAL 879.2(2019):87.