DOI: 10.1002/2015GL063946
论文题名: Time domain structures: What and where they are, what they do, and how they are made
作者: Mozer F.S. ; Agapitov O.V. ; Artemyev A. ; Drake J.F. ; Krasnoselskikh V. ; Lejosne S. ; Vasko I.
刊名: Geophysical Research Letters
ISSN: 0094-9183
EISSN: 1944-8914
出版年: 2015
卷: 42, 期: 10 起始页码: 3627
结束页码: 3638
语种: 英语
英文关键词: double layers
; electron holes
; time domain structures
Scopus关键词: Electric fields
; Electrons
; Ionizing radiation
; Magnetic fields
; Magnetism
; Precipitation (chemical)
; Radiation belts
; Solitons
; Auroral particle precipitations
; Double layers
; Electric and magnetic fields
; Electron hole
; Field-aligned electrons
; Parallel electric fields
; Time domain
; Van allen radiation belts
; Atmospherics
; atmospheric electricity
; aurora
; correlation
; electric field
; electron
; magnetic field
; scattering
; time domain reflectometry
; Pachycephalidae
英文摘要: Time domain structures (TDS) (electrostatic or electromagnetic electron holes, solitary waves, double layers, etc.) are ≥1 ms pulses having significant parallel (to the background magnetic field) electric fields. They are abundant through space and occur in packets of hundreds in the outer Van Allen radiation belts where they produce magnetic-field-aligned electron pitch angle distributions at energies up to a hundred keV. TDS can provide the seed electrons that are later accelerated to relativistic energies by whistlers and they also produce field-aligned electrons that may be responsible for some types of auroras. These field-aligned electron distributions result from at least three processes. The first process is parallel acceleration by Landau trapping in the TDS parallel electric field. The second process is Fermi acceleration due to reflection of electrons by the TDS. The third process is an effective and rapid pitch angle scattering resulting from electron interactions with the perpendicular and parallel electric and magnetic fields of many TDS. TDS are created by current-driven and beam-related instabilities and by whistler-related processes such as parametric decay of whistlers and nonlinear evolution from oblique whistlers. New results on the temporal relationship of TDS and particle injections, types of field-aligned electron pitch angle distributions produced by TDS, the mechanisms for generation of field-aligned distributions by TDS, the maximum energies of field-aligned electrons created by TDS in the absence of whistler mode waves, TDS generation by oblique whistlers and three-wave-parametric decay, and the correlation between TDS and auroral particle precipitation, are presented. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931334139&doi=10.1002%2f2015GL063946&partnerID=40&md5=e0c015dd5e64c28ddadd0db674e05649
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8799
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:
Mozer F.S.,Agapitov O.V.,Artemyev A.,et al. Time domain structures: What and where they are, what they do, and how they are made[J]. Geophysical Research Letters,2015-01-01,42(10).