| DOI: | 10.1002/2014GL060450
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| 论文题名: | Kelvin-Helmholtz unstable magnetotail flow channels: Deceleration and radiation of MHD waves |
| 作者: | Turkakin H.; Mann I.R.; Rankin R.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10615
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| EISSN: | 1944-10346
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| 出版年: | 2014
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| 卷: | 41, 期:11 | | 起始页码: | 3691
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| 结束页码: | 3697
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| 语种: | 英语
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| 英文关键词: | Kelvin-Helmholtz instability
; magnetosonic wave emission
; magnetotail dynamics
; MHD shear flow instabilities
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| Scopus关键词: | Channel flow
; Shear flow
; Solar system
; Bursty bulk flow (BBFs)
; Flow instabilities
; Generation mechanism
; Kelvin-helmholtz instabilities
; Magnetosonic waves
; Magnetotail dynamics
; MHD oscillations
; Propagating mode
; Magnetohydrodynamics
; flow velocity
; Kelvin-Helmholtz instability
; magnetic field
; magnetohydrodynamics
; magnetotail
; oscillating flow
; wave propagation
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| 英文摘要: | The Kelvin-Helmholtz instability (KHI) of magnetotail flow channels associated with bursty bulk flows (BBFs) is investigated. MHD oscillations of the channel in both kink and sausage modes are investigated for KHI, and both the primary and secondary KHIs are found that drive MHD waves. These instabilities are likely to be important for flow channel braking where the KHI removes energy from the flow. At flow speeds above the peak growth rate, the MHD modes excited by KHI develop from surface modes into propagating modes leading to the radiation of MHD waves from the flow channel. The coupling of BBF-driven shear flow instabilities to MHD waves presented here represents a new paradigm to explain BBF excitation of tail flapping. Our model can also explain, for the first time, the generation mechanism for the observations of waves propagating toward both flanks and emitted from BBF channels in the magnetotail. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901732534&doi=10.1002%2f2014GL060450&partnerID=40&md5=f7c723013e7cc76a7134dd482c773e9a
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7879
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Physics, University of Alberta, Edmonton, AB, Canada
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| Recommended Citation: | |
Turkakin H.,Mann I.R.,Rankin R.. Kelvin-Helmholtz unstable magnetotail flow channels: Deceleration and radiation of MHD waves[J]. Geophysical Research Letters,2014-01-01,41(11).
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