High-resolution Statistics of Solar Wind Turbulence at Kinetic Scales Using the Magnetospheric Multiscale Mission
High-resolution Statistics of Solar Wind Turbulence at Kinetic Scales Using the Magnetospheric Multiscale Mission
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DOI：
10.3847/2041-8213/aa7ddd
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发表时间：
2017-07
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通讯作者：
A. Chasapis;W. Matthaeus;T. Parashar;S. Fuselier;B. Maruca;T. Phan;J. Burch;T. Moore;C. Pollock;D. Gershman;R. Torbert;C. Russell;R. Strangeway
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作者：
A. Chasapis;W. Matthaeus;T. Parashar;S. Fuselier;B. Maruca;T. Phan;J. Burch;T. Moore;C. Pollock;D. Gershman;R. Torbert;C. Russell;R. Strangeway
利用在太阳风中获得的磁层多尺度（MMS）和星团任务的数据，我们检查了归一化为离子惯性尺度的不同空间滞后的二阶和四阶结构函数。该分析包括直接的双航天器结果和采用熟悉的泰勒冻结流近似的单航天器结果。一些熟悉的统计结果，包括能量的光谱分布和依赖于销售的峰度，被扩展到前所未有的〜6公里的空间尺度，接近电子尺度。尽管在动力学范围内存在小偏差，但泰勒近似在这些小尺度上也得到了证实。峰度在亚质子尺度上达到非常高的值，支持了先前报道的建议，即单分形行为可能是由于动力学尺度上的高频等离子体波造成的。
Using data from the Magnetospheric Multiscale (MMS) and Cluster missions obtained in the solar wind, we examine second-order and fourth-order structure functions at varying spatial lags normalized to ion inertial scales. The analysis includes direct two-spacecraft results and single-spacecraft results employing the familiar Taylor frozen-in flow approximation. Several familiar statistical results, including the spectral distribution of energy, and the sale-dependent kurtosis, are extended down to unprecedented spatial scales of ∼6 km, approaching electron scales. The Taylor approximation is also confirmed at those small scales, although small deviations are present in the kinetic range. The kurtosis is seen to attain very high values at sub-proton scales, supporting the previously reported suggestion that monofractal behavior may be due to high-frequency plasma waves at kinetic scales.