气候变化领域集成服务门户(CCPortal): Nonlinear Interactions Between Radiation Belt Electrons and Chorus Waves: Dependence on Wave Amplitude Modulation

CCPortal

DOI	10.1029/2019GL085987
	Nonlinear Interactions Between Radiation Belt Electrons and Chorus Waves: Dependence on Wave Amplitude Modulation
	Gan L.; Li W.; Ma Q.; Albert J.M.; Artemyev A.V.; Bortnik J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	We use test particle simulations to model the interaction between radiation belt electrons and whistler mode chorus waves by focusing on wave amplitude modulations. We quantify the pitch angle and energy changes due to phase trapping and phase bunching (including both advection and scattering) for electrons with various initial energies and pitch angles. Three nonlinear regimes are identified in a broad range of pitch angle-energy space systematically, each indicating different nonlinear effects. Our simulation results show that wave amplitude modulations can extend the nonlinear regimes, while significantly reducing electron acceleration by phase trapping. By including amplitude modulations, the “advective” changes in pitch angle and energy caused by phase bunching are reduced, while the “diffusive” scattering due to phase bunching is enhanced. Our study demonstrates the importance of wave amplitude modulations in nonlinear effects and suggests that they need to be properly incorporated into future theoretical and numerical studies. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Amplitude modulation; Electromagnetic waves; Electrons; Radiation belts; Chorus waves; Nonlinear interactions; phase bunching; Phase trapping; Wave amplitudes; Atmospherics; acceleration; advection; amplitude; electromagnetic radiation; electromagnetic wave; electron density; irradiation; trapping; wave scattering; wave velocity
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/170687
作者单位	Center for Space Physics, Boston University, Boston, MA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Air Force Research Laboratory, Kirtland Air Force Base, Albuquerque, NM, United States; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Gan L.,Li W.,Ma Q.,et al. Nonlinear Interactions Between Radiation Belt Electrons and Chorus Waves: Dependence on Wave Amplitude Modulation[J],2020,47(4).
APA	Gan L.,Li W.,Ma Q.,Albert J.M.,Artemyev A.V.,&Bortnik J..(2020).Nonlinear Interactions Between Radiation Belt Electrons and Chorus Waves: Dependence on Wave Amplitude Modulation.Geophysical Research Letters,47(4).
MLA	Gan L.,et al."Nonlinear Interactions Between Radiation Belt Electrons and Chorus Waves: Dependence on Wave Amplitude Modulation".Geophysical Research Letters 47.4(2020).