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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Quantitative estimates of the slab and 2-D power insolar wind turbulence using multispacecraft data
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Quantitative estimates of the slab and 2-D power insolar wind turbulence using multispacecraft data

机译：定量的估计板和二维的力量使用multispacecraft insolar风湍流数据

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摘要

A quantitative estimate of the field-aligned anisotropy of magnetohydrodynamicinertial range turbulence is obtained by comparing multispacecraft data with a fully three-dimensional turbulent magnetic field numerical model. The simulated turbulence is asuperposition of slab fluctuations parallel to the mean field and 2-D fluctuationsperpendicular to it. This model is fitted to spatial autocorrelation functions, computedfrom measurements made by the four Cluster spacecraft in the solar wind, by varying theslab-2-D fraction. The mean power in the 2-D fluctuations, 81 ± 3%, is consistent withsolar wind fluctuations being anisotropic with energy mainly in wave vectorsperpendicular to the large-scale mean magnetic field. Eight intervals of multipointmagnetic field data are analyzed, and a large degree of variation in the anisotropyestimates about the mean is observed. The origin of this variability is unclear. However,variations in the anisotropy estimates are correlated between different field components
机译：field-aligned的定量估计各向异性magnetohydrodynamicinertial范围湍流是通过比较获得的与一个完全multispacecraft数据三维湍流磁场数值模型。平行板asuperposition波动平均场和二维fluctuationsperpendicular到它。自相关函数,computedfrom测量由这四个集群航天器在太阳风中,通过改变theslab-2-D分数。81±3%,withsolar风是一致的波动与能源主要是各向异性在波vectorsperpendicular大规模意味着磁场。multipointmagnetic字段数据进行分析,大程度的变化anisotropyestimates意思是观察。这个变化的起源尚不清楚。然而,各向异性的变化估计不同组件之间的关联吗

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