| DOI: | 10.1002/2014GL059893
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| 论文题名: | Wave activities in separatrix regions of magnetic reconnection |
| 作者: | Fujimoto K.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10131
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| EISSN: | 1944-9862
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| 出版年: | 2014
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| 卷: | 41, 期:8 | | 起始页码: | 2721
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| 结束页码: | 2728
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| 语种: | 英语
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| 英文关键词: | electron acceleration
; fully kinetic simulations
; magnetic reconnection
; plasma waves and instabilities
; wave-particle interactions
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| Scopus关键词: | Electron beams
; Electrons
; Electron acceleration
; Kinetic simulation
; Magnetic reconnections
; Plasma waves and instabilities
; Wave-particle interactions
; Magnetoplasma
; acceleration
; electron
; instability
; magnetic field
; magnetotail
; solitary wave
; two-dimensional modeling
; wave generation
; wave propagation
; wave scattering
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| 英文摘要: | Two-dimensional particle-in-cell simulations have reproduced the waves consistent with those observed frequently in the separatrix regions of magnetic reconnection in the Earth's magnetotail. The key process generating the waves is intense parallel acceleration of the electrons due to an electrostatic potential hump formed in the inflow side of the separatrices. The intense electron beams trigger the electron two-stream instability (ETSI) and the beam-driven whistler instability (WI). The Buneman instability (BI) is also excited by moderate electron beams arising upstream the potential hump. The ETSI generates the Langmuir waves, while the BI gives lower hybrid waves. Both modes evolve the electrostatic solitary waves in the nonlinear phases. The ETSI traps the electrons in the parallel direction and forms a flat-top distribution with high-energy cutoff. On the other hand, the WI scatters the electrons in the perpendicular direction, producing isotropic distribution with nonthermal high-energy tail. Key Points Waves near reconnection separatrices are successfully reproduced in simulations Wave generation mechanisms are identified using fully kinetic linear analyses The waves are responsible for the flat-top electrons with nonthermal component ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898767268&doi=10.1002%2f2014GL059893&partnerID=40&md5=d4ccb5571c7f3d347dd26fc80beea1a3
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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/7395
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Tokyo, Mitaka, Japan
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| Recommended Citation: | |
Fujimoto K.. Wave activities in separatrix regions of magnetic reconnection[J]. Geophysical Research Letters,2014-01-01,41(8).
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