DOI: 10.1002/2014GL062598
论文题名: Evidence for generation of unstable suprathermal electron population in the auroral F region
作者: Akbari H. ; Semeter J.L. ; Hirsch M.A. ; Guio P. ; Nicolls M.J.
刊名: Geophysical Research Letters
ISSN: 0094-9048
EISSN: 1944-8779
出版年: 2015
卷: 42, 期: 2 起始页码: 185
结束页码: 192
语种: 英语
英文关键词: auroral ionosphere
; incoherent scatter radar
; Langmuir turbulence
; plasma instability
; suprathermal electrons
Scopus关键词: Electromagnetic fields
; Electrons
; F region
; Free energy
; Ionosphere
; Ionospheric measurement
; Plasma diagnostics
; Plasma stability
; Turbulence
; Auroral ionosphere
; Electron population
; Incoherent scatter radar
; Langmuir turbulence
; Langmuir waves
; Physical mechanism
; Spectral feature
; Suprathermal electrons
; Radar
; altitude
; atmospheric wave
; aurora
; correlation
; F region
; simulation
; turbulence
; unsteady flow
英文摘要: Anomalous incoherent scatter radar (ISR) spectra confined to narrow altitude ranges near the F region peak and correlated with dynamic auroral precipitation have previously been identified and explained in terms of the cavitating beam-driven Langmuir turbulence. In this work we used a one-dimensional Zakharov simulation to constrain the range of physical mechanisms underlying these observational features. We find that although Langmuir wave collapse and caviton formation generated by electron beams with energies of 1 keV can give rise to similar radar echoes, the predicted spectral features and intensities of such echoes are inconsistent with experimental data acquired by various ISRs. Our results suggest that the free energy for the turbulence must be provided by unstable low-energy (5 - 20 eV) electron populations and that such populations must be produced locally in the F region ionosphere. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923636462&doi=10.1002%2f2014GL062598&partnerID=40&md5=325a0d4c8e93d86907d5226bd13e118e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8664
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: Department of Electrical and Computer Engineering, Center for Space Physics, Boston University, Boston, MA, United States
Recommended Citation:
Akbari H.,Semeter J.L.,Hirsch M.A.,et al. Evidence for generation of unstable suprathermal electron population in the auroral F region[J]. Geophysical Research Letters,2015-01-01,42(2).