DOI: 10.1002/2016GL069872
论文题名: Current-driven Langmuir oscillations and formation of wave packets via modulational instability: Relevance to STEREO observations
作者: Sauer K. ; Sydora R.D.
刊名: Geophysical Research Letters
ISSN: 0094-8883
EISSN: 1944-8614
出版年: 2016
卷: 43, 期: 14 起始页码: 7348
结束页码: 7355
语种: 英语
英文关键词: kinetic simulations
; Langmuir waves
; modulational instability
; solitons
; type III radio bursts
Scopus关键词: Acoustic waves
; Acoustics
; Electric fields
; Ion acoustic waves
; Ions
; Modulation
; Plasma simulation
; Plasma stability
; Plasma waves
; Solar wind
; Solitons
; Stability
; Electron population
; Electrostatic instabilities
; Kinetic simulation
; Langmuir oscillations
; Langmuir waves
; Modulational instability
; Plasma frequencies
; Radio bursts
; Plasma diagnostics
英文摘要: Recently, it has been shown that Langmuir oscillations (LOs) at the plasma frequency can be driven by an electron current without any electrostatic instability. This current may appear due to a (small) drift of the whole electron population against the ions or by beam electrons after their relaxation to a plateau-like distribution. The consequences of LOs for nonlinear wave phenomena in this scenario are studied by means of kinetic plasma simulations. It is shown that the electric field of LOs can act as a pump wave and generate Langmuir envelope solitons via the modulational instability. In this way, both counterstreaming Langmuir and ion-acoustic waves arise with the same wave number. For solar wind conditions the Doppler shift leads to the generation of satellite peaks with frequencies symmetric around the plasma frequency. Simultaneously, a peak appears in the ion-acoustic branch. These results agree well with recent STEREO observations in the solar wind. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84979261607&doi=10.1002%2f2016GL069872&partnerID=40&md5=26af4d6643f1d41f732120a38a18d9fd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9846
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 Physics, University of Alberta, Edmonton, AB, Canada
Recommended Citation:
Sauer K.,Sydora R.D.. Current-driven Langmuir oscillations and formation of wave packets via modulational instability: Relevance to STEREO observations[J]. Geophysical Research Letters,2016-01-01,43(14).