Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution

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	Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution
	Lembege, Bertrand; Yang, Zhongwei; Lembege, B (reprint author), CNRS, UVSQ, IPSL, LATMOS, F-78280 Guyancourt, France.
作者部门	空间科学部
发表期刊	ASTROPHYSICAL JOURNAL
	2018
卷号	860 期号:1 页码:84
ISSN	0004-637X
语种	英语
关键词	Acceleration Of Particles Plasmas Shock Waves Sun: Heliosphere
摘要	The impact of the nonstationarity of the heliospheric termination shock in the presence of pickup ions (PUIs) on the energy partition between different plasma components is analyzed self-consistently by using a one-dimensional particle-in-cell simulation code. Solar wind ions (SWIs) and PUIs are introduced as Maxwellian and shell distributions, respectively. For a fixed time, (a) with a percentage of 25% PUIs, a large part of the downstream thermal pressure is carried by reflected PUIs, in agreement with previous hybrid simulations; (b) the total downstream distribution includes three main components: (i) a low-energy component dominated by directly transmitted (DT) SWIs, (ii) a high-energy component dominated by reflected PUIs, and (iii) an intermediate-energy component dominated by reflected SWIs and DT PUIs. Moreover, results show that the front nonstationarity (self-reformation) persists even in presence of 25% PUIs, and has some impacts on both SWIs and PUIs: (a) the rate of reflected ions suffers some time fluctuations for both SWIs and PUIs; (b) the relative percentage of downstream thermal pressure transfered to PUIs and SWIs also suffers some time fluctuations, but depends on the relative distance from the front; (c) the three components within the total downstream heliosheath distribution persist in time, but the contribution of the ion subpopulations to the low-and intermediate-energy components are redistributed by the front nonstationarity. Our results allow clarifying the respective roles of SWIs and PUIs as a viable production source of energetic neutral atoms and are compared with previous results.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.nssc.ac.cn/handle/122/6361
专题	空间科学部
通讯作者	Lembege, B (reprint author), CNRS, UVSQ, IPSL, LATMOS, F-78280 Guyancourt, France.
推荐引用方式 GB/T 7714	Lembege, Bertrand,Yang, Zhongwei,Lembege, B . Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution[J]. ASTROPHYSICAL JOURNAL,2018,860(1):84.
APA	Lembege, Bertrand,Yang, Zhongwei,&Lembege, B .(2018).Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution.ASTROPHYSICAL JOURNAL,860(1),84.
MLA	Lembege, Bertrand,et al."Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution".ASTROPHYSICAL JOURNAL 860.1(2018):84.

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