DOI: 10.1002/2015GL066887
论文题名: Nonlinear local parallel acceleration of electrons through Landau trapping by oblique whistler mode waves in the outer radiation belt
作者: Agapitov O.V. ; Artemyev A.V. ; Mourenas D. ; Mozer F.S. ; Krasnoselskikh V.
刊名: Geophysical Research Letters
ISSN: 0094-8338
EISSN: 1944-8069
出版年: 2015
卷: 42, 期: 23 起始页码: 10140
结束页码: 10149
语种: 英语
英文关键词: Landau resonance
; nonlinear acceleration of electrons
; oblique whistlers
; radiation belts
; seed population
Scopus关键词: Electric fields
; Electromagnetic waves
; Electron energy levels
; Electrons
; Geomagnetism
; Magnetoplasma
; Radiation belts
; Velocity distribution
; Accelerated electrons
; Effective potentials
; Electric field components
; Electron velocity distributions
; Inhomogeneous geomagnetic field
; Landau resonance
; Oblique whistlers
; Simultaneous observation
; Atmospherics
; computer simulation
; electric field
; electromagnetic wave
; electron density
; geomagnetic field
; numerical model
; resonance
; Pachycephalidae
英文摘要: Simultaneous observations of electron velocity distributions and chorus waves by the Van Allen Probe B are analyzed to identify long-lasting (more than 6 h) signatures of electron Landau resonant interactions with oblique chorus waves in the outer radiation belt. Such Landau resonant interactions result in the trapping of ∼1-10 keV electrons and their acceleration up to 100-300 keV. This kind of process becomes important for oblique whistler mode waves having a significant electric field component along the background magnetic field. In the inhomogeneous geomagnetic field, such resonant interactions then lead to the formation of a plateau in the parallel (with respect to the geomagnetic field) velocity distribution due to trapping of electrons into the wave effective potential. We demonstrate that the electron energy corresponding to the observed plateau remains in very good agreement with the energy required for Landau resonant interaction with the simultaneously measured oblique chorus waves over 6 h and a wide range of L shells (from 4 to 6) in the outer belt. The efficient parallel acceleration modifies electron pitch angle distributions at energies ∼50-200 keV, allowing us to distinguish the energized population. The observed energy range and the density of accelerated electrons are in reasonable agreement with test particle numerical simulations. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953635306&doi=10.1002%2f2015GL066887&partnerID=40&md5=500f7e6812d3e1353d4b41ec76e24ead
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7954
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: Space Sciences Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Agapitov O.V.,Artemyev A.V.,Mourenas D.,et al. Nonlinear local parallel acceleration of electrons through Landau trapping by oblique whistler mode waves in the outer radiation belt[J]. Geophysical Research Letters,2015-01-01,42(23).