Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region

doi:10.1007/s11430-019-9330-3

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region
	He, Jiansen 1; Duan, Die 1; Zhu, Xingyu 1; Yan, Limei 2; Wang, Linghua 1
刊名	SCIENCE CHINA-EARTH SCIENCES
	2019-04-01
卷号	62 期号:4 页码:619-630
关键词	Solar wind Foreshock Wave-particle interaction Parametric instability
ISSN号	1674-7313
DOI	10.1007/s11430-019-9330-3
英文摘要	The foreshock with nascent plasma turbulence is regarded as a fascinating region to understand basic plasma physical processes, e.g., wave-particle interactions as well as wave-wave couplings. Although there have been plenty of intensive studies on this topic, some key clues about the physical processes still lack observations. A relatively comprehensive case study with some new observations is presented in this work based on the WIND spacecraft observations. In this case, upstream energetic protons were drifting at tens of Alfven speed with respect to the background plasma protons. When looking at the magnetic wave activities, we find the co-existence of high-frequency (0.1-0.5 Hz) large-amplitude right-hand polarized (RHP) waves and low-frequency (0.02-0.1 Hz) small-amplitude left-hand polarized (LHP) waves in the spacecraft (SC) frame. The observed anticorrelation between magnetic and velocity fluctuations along with the sunward magnetic field direction indicates that the low-frequency LHP waves in the SC frame are in fact the sunward upstream RHP Alfvenic waves in the solar wind frame. This new observation corroborates the applicability of theories about plasma non-resonance instability and inverse cascade to the foreshock region, where the downstream high-frequency RHP parent waves are excited by the upstream energetic protons through non-resonance instability and the low-frequency RHP daughter waves are generated by the parent waves due to nonlinear parametric instability. Furthermore, enhanced downstream energetic proton fluxes are inferred to result from scattering of the upstream protons by the nascent turbulent fluctuations. Therefore, some critical clues about the newborn turbulence in the foreshock are provided in this work.
资助项目	National Natural Science Foundation of China[41574168] ; National Natural Science Foundation of China[41874200] ; National Natural Science Foundation of China[41674171] ; National Natural Science Foundation of China[41774183] ; National Natural Science Foundation of China[41421003]
WOS关键词	MODULATIONAL INSTABILITY ; FINITE-AMPLITUDE ; NONLINEAR ALFVEN ; MAGNETIC-FIELD ; UPSTREAM WAVES ; ACCELERATION ; FLUCTUATIONS ; SIMULATION ; EVOLUTION ; SPECTRA
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000462228900002
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/91076]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	He, Jiansen
作者单位	1.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	He, Jiansen,Duan, Die,Zhu, Xingyu,et al. Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region[J]. SCIENCE CHINA-EARTH SCIENCES,2019,62(4):619-630.
APA	He, Jiansen,Duan, Die,Zhu, Xingyu,Yan, Limei,&Wang, Linghua.(2019).Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region.SCIENCE CHINA-EARTH SCIENCES,62(4),619-630.
MLA	He, Jiansen,et al."Observational evidences of wave excitation and inverse cascade in a distant Earth foreshock region".SCIENCE CHINA-EARTH SCIENCES 62.4(2019):619-630.