气候变化领域集成服务门户(CCPortal): High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region

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DOI	10.1029/2020GL087111
	High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region
	Dokgo K.; Hwang K.-J.; Burch J.L.; Yoon P.H.; Graham D.B.; Li W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:5
英文摘要	National Aeronautics and Space Administration's Magnetosphere Multiscale mission reveals that agyrotropic electrons and intense waves are prevalently present in the electron diffusion region. Prompted by two distinct Magnetosphere Multiscale observations, this letter investigates by theoretical means and the properties of agyrotropic electron beam-plasma instability and explains the origin of different structures in the wave spectra. The difference is owing to the fact that in one instance, a continuous beam mode is excited, while in the other, discrete Bernstein modes are excited, and the excitation of one mode versus the other depends on physical input parameters, which are consistent with observations. Analyses of dispersion relations show that the growing mode becomes discrete when the maximum growth rate is lower than the electron cyclotron frequency. Making use of particle-in-cell simulations, we found that the broadening angle (Formula presented.) in the gyroangle space is also an important factor controlling the growth rate. Ramifications of the present finding are also discussed. ©2020. The Authors.
英文关键词	Beam plasma interactions; Cyclotrons; Diffusion; Dispersion (waves); Electromagnetic fields; Magnetoplasma; Magnetosphere; NASA; Plasma diagnostics; Plasma simulation; Plasma stability; Dispersion analysis; Dispersion relations; Electron cyclotron frequency; Electron diffusion; High frequency waves; Magnetic reconnections; Particle-in-cell simulations; Wave instability; Electrons; electromagnetic field; electron; magnetosphere
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170600
作者单位	Southwest Research Institute, San Antonio, TX, United States; Institute for Physical Science and Technology, University of Maryland, College Park, MD, United States; Korea Astronomy and Space Science Institute, Daejeon, South Korea; School of Space Research, Kyung Hee University, Yongin, South Korea; Swedish Institute of Space Physics, Uppsala, Sweden; State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Dokgo K.,Hwang K.-J.,Burch J.L.,et al. High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region[J],2020,47(5).
APA	Dokgo K.,Hwang K.-J.,Burch J.L.,Yoon P.H.,Graham D.B.,&Li W..(2020).High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region.Geophysical Research Letters,47(5).
MLA	Dokgo K.,et al."High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region".Geophysical Research Letters 47.5(2020).