气候变化领域集成服务门户(CCPortal): Rapid Frequency Variations Within Intense Chorus Wave Packets

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DOI	10.1029/2020GL088853
	Rapid Frequency Variations Within Intense Chorus Wave Packets
	Zhang X.-J.; Mourenas D.; Artemyev A.V.; Angelopoulos V.; Kurth W.S.; Kletzing C.A.; Hospodarsky G.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Whistler mode chorus waves are responsible for electron acceleration in Earth's radiation belts. It is unclear, however, whether the observed acceleration is still well described by quasi-linear theory, or if this acceleration is due to intense waves that require nonlinear treatment. Here, we perform a comprehensive statistical analysis of intense lower-band chorus wave packets to investigate the relationships between wave frequency variations, packet length, and wave amplitude, and their temporal variability. We find that 15% of the wave power is carried by long packets, with low frequency sweep rates (linear trend in time) that agree with the nonlinear theory of chorus wave growth. Eighty-five percent of the wave power, however, comes from short packets with large frequency variations around the linear trend. The kappa-like probability distribution of these variations is consistent with random superposition of different waves that could result in a destruction of nonlinear resonant interaction. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electromagnetic waves; Probability distributions; Radiation belts; Wave packets; Wave power; Earth's radiation belts; Electron acceleration; Frequency variation; Nonlinear treatments; Quasilinear theory; Resonant interaction; Temporal variability; Whistler-mode chorus; Atmospherics; acceleration; amplitude; probability; temporal variation; wave power; wavelength
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/170043
作者单位	Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States; CEA, DAM, DIF, Arpajon, France; Laboratoire Matière sous Conditions Extrêmes, Université Paris-Saclay, CEA, Bruyères-le-Châtel, France; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
推荐引用方式 GB/T 7714	Zhang X.-J.,Mourenas D.,Artemyev A.V.,et al. Rapid Frequency Variations Within Intense Chorus Wave Packets[J],2020,47(15).
APA	Zhang X.-J..,Mourenas D..,Artemyev A.V..,Angelopoulos V..,Kurth W.S..,...&Hospodarsky G.B..(2020).Rapid Frequency Variations Within Intense Chorus Wave Packets.Geophysical Research Letters,47(15).
MLA	Zhang X.-J.,et al."Rapid Frequency Variations Within Intense Chorus Wave Packets".Geophysical Research Letters 47.15(2020).