DOI: 10.1002/2013GL058482
论文题名: Dependence of solar wind speed on the local magnetic field orientation: Role of Alfvénic fluctuations
作者: Matteini L. ; Horbury T.S. ; Neugebauer M. ; Goldstein B.E.
刊名: Geophysical Research Letters
ISSN: 0094-10464
EISSN: 1944-10195
出版年: 2014
卷: 41, 期: 2 起始页码: 259
结束页码: 265
语种: 英语
英文关键词: Alfvénic fluctuations
; interplanetary magnetic field
; Solar wind
Scopus关键词: Solar wind
; Fast solar winds
; Interplanetary magnetic fields
; Local magnetic field
; Magnetic field reversal
; Magnetic field vectors
; Solar wind plasmas
; Solar wind speed
; Velocity fluctuations
; Magnetic fields
; correlation
; magnetic field
; plasma
; solar wind
; wind velocity
英文摘要: We report an analysis of correlations between magnetic field and velocity fluctuations in the fast solar wind beyond 1 AU at high latitudes. We have found that on scales shorter than the microstream structures, there exists a well-defined dependence of the flow speed on the angle between the magnetic field vector and the radial direction. Solar wind is found to be slightly faster when the measured magnetic field vector is transverse to the velocity, while it is always slower when the magnetic field is parallel, or antiparallel, to the radial direction. We show that this correlation is a direct consequence of the high Alfvénicity of fast wind fluctuations and that it can be reasonably described by a simple model taking into account the main properties of the low-frequency antisunward Alfvén fluctuations as observed in the solar wind plasma. We also discuss how switchbacks, short periods of magnetic field reversals, naturally fit in this new observed correlation. ©2013. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892963886&doi=10.1002%2f2013GL058482&partnerID=40&md5=bbc5fb84b94b940e82ae962bf3533f68
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7728
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Imperial College London, London, United Kingdom
Recommended Citation:
Matteini L.,Horbury T.S.,Neugebauer M.,et al. Dependence of solar wind speed on the local magnetic field orientation: Role of Alfvénic fluctuations[J]. Geophysical Research Letters,2014-01-01,41(2).