气候变化领域集成服务门户(CCPortal): Excitation of Whistler Waves Through the Bidirectional Field-Aligned Electron Beams With Electron Temperature Anisotropy: MMS Observations

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DOI	10.1029/2020GL087515
	Excitation of Whistler Waves Through the Bidirectional Field-Aligned Electron Beams With Electron Temperature Anisotropy: MMS Observations
	Huang S.Y.; Xu S.B.; He L.H.; Jiang K.; Yuan Z.G.; Deng X.H.; Wei Y.Y.; Zhang J.; Zhang Z.H.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:14
英文摘要	Using four-point measurements from the Magnetospheric Multiscale (MMS) mission, we identify whistler waves at the boundary of an ion scale magnetic hole, which should be locally excited rather than propagated from other regions. Based on the measured local plasma parameters, which include those for bidirectional electron beams with electron temperature anisotropy, the frequency range with the growth rate derived from kinetic theory is consistent with the observations, while the growth rate in the absence of such beams is negative; hence, the observed whistler waves are locally excited by the bidirectional electron beams with electron temperature anisotropy. The dispersion relation, derived from one-dimensional particle-in-cell simulations that are conducted using the inputs of the bidirectional electron beams with electron temperature anisotropy, agrees well with the one from kinetic theory, which further supports this excitation mechanism. Our results shed light on a new excitation mechanism for whistler waves. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Anisotropy; Atmospherics; Electron beams; Electrons; Excited states; Kinetic theory; Magnetosphere; Plasma simulation; Bidirectional electrons; Dispersion relations; Electron temperature anisotropy; Excitation mechanisms; Field-aligned electrons; Four-point measurements; Magnetospheric multiscale missions; Particle-in-cell simulations; Electron temperature; electromagnetic field; electron; growth rate; ion exchange; magnetosphere; plasma; temperature profile; wave dispersion
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/170138
作者单位	School of Electronic Information, Wuhan University, Wuhan, China; Institute of Space Science and Technology, Nanchang University, Nanchang, China
推荐引用方式 GB/T 7714	Huang S.Y.,Xu S.B.,He L.H.,et al. Excitation of Whistler Waves Through the Bidirectional Field-Aligned Electron Beams With Electron Temperature Anisotropy: MMS Observations[J],2020,47(14).
APA	Huang S.Y..,Xu S.B..,He L.H..,Jiang K..,Yuan Z.G..,...&Zhang Z.H..(2020).Excitation of Whistler Waves Through the Bidirectional Field-Aligned Electron Beams With Electron Temperature Anisotropy: MMS Observations.Geophysical Research Letters,47(14).
MLA	Huang S.Y.,et al."Excitation of Whistler Waves Through the Bidirectional Field-Aligned Electron Beams With Electron Temperature Anisotropy: MMS Observations".Geophysical Research Letters 47.14(2020).