DOI: 10.1002/grl.50807
论文题名: First magnetic seismology of the CME reconnection outflow layer in the low corona with 2.5-D MHD simulations of the Kelvin-Helmholtz instability
作者: Nykyri K. ; Foullon C.
刊名: Geophysical Research Letters
ISSN: 0094-8686
EISSN: 1944-8417
出版年: 2013
卷: 40, 期: 16 起始页码: 4154
结束页码: 4159
语种: 英语
英文关键词: CME ejecta
; Kelvin-Helmholtz instability
; magnetic seismology
Scopus关键词: CME ejecta
; Coronal mass ejection
; Kelvin-helmholtz instabilities
; Magnetic field strengths
; Magnetohydrodynamic simulations
; MHD experiments
; Perpendicular orientation
; Time development
; Magnetic fields
; Seismology
; Shear flow
; Magnetohydrodynamics
; coronal mass ejection
; Kelvin-Helmholtz instability
; magnetic field
; magnetohydrodynamics
; plasma
; seismology
; vorticity
英文摘要: For conditions observed in the low corona, we perform 2.5-D magnetohydrodynamic (MHD) simulations of the Kelvin-Helmholtz instability (KHI) at the surface of a coronal mass ejection (CME). We match the observed time development of the KHI with simulated growth from 110 MHD experiments representing a parametric range of realistic magnetic field strengths and orientations and two key values of the velocity shear, ΔV, inferred from observations. The results are field strengths Be≈ 8-9 G and B s≈ 10-11 G in the CME reconnection outflow layer and the surrounding sheath, respectively, for ΔV≈770kms-1; for nearly perpendicular orientation (1° tilt) of Bs with respect to the flow plane, Be can be tilted between 3 and 10°; tilting Bs up to 15° would slow the growth of the KHI by too much. Our simulations also reveal hidden dynamics and structure of the CME ejecta layer such as plasma mixing via reconnection in the vortices. Key Points Magnetic field is determined for the first time in the CME ejecta and sheath Magnetic field of the CME ejecta (sheath) can be 8-9 G (10-11 G) The KHI and associated plasma mixing may impact CME geo-effectiveness. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84882545073&doi=10.1002%2fgrl.50807&partnerID=40&md5=3a43955518f137a657cb084b84cbb3dd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5950
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach FL 32114, United States
Recommended Citation:
Nykyri K.,Foullon C.. First magnetic seismology of the CME reconnection outflow layer in the low corona with 2.5-D MHD simulations of the Kelvin-Helmholtz instability[J]. Geophysical Research Letters,2013-01-01,40(16).