DOI: 10.1002/2015GL064182
论文题名: Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
作者: Fu X. ; Guo Z. ; Dong C. ; Gary S.P.
刊名: Geophysical Research Letters
ISSN: 0094-9268
EISSN: 1944-8999
出版年: 2015
卷: 42, 期: 9 起始页码: 3150
结束页码: 3159
语种: 英语
英文关键词: banded chorus
; nonlinear theory
; subcyclotron resonance
Scopus关键词: Collisionless plasmas
; Cyclotrons
; Magnetosphere
; Angular frequencies
; Banded chorus
; Effective energy
; Electron cyclotron frequency
; Electron cyclotrons
; Non-linear theory
; Nonlinear mechanisms
; Whistler waves
; Atmospherics
; energy flux
; formation mechanism
; frequency analysis
; magnetosphere
; nonlinearity
; resonance
; wave property
英文摘要: An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe , where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe . Here we present a novel nonlinear mechanism for the formation of these gaps using Hamiltonian theory and test particle simulations in a homogeneous, magnetized, collisionless plasma. We find that an oblique whistler wave with frequency at a fraction of the electron cyclotron frequency can resonate with electrons, leading to effective energy exchange between the wave and particles. Key Points Recent observations of chorus show multiple bands Nonlinear wave-particle resonances can occur at subcyclotron frequencies Subcyclotron resonance may lead to formation of gaps in banded chorus ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930477034&doi=10.1002%2f2015GL064182&partnerID=40&md5=0591e1b7a0809b00b6cc3d55c94a3237
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8884
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Fu X.,Guo Z.,Dong C.,et al. Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus[J]. Geophysical Research Letters,2015-01-01,42(9).