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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Processes in the Current Disruption Region: From Turbulence to Dispersion Relation
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Processes in the Current Disruption Region: From Turbulence to Dispersion Relation

机译：流程在当前中断地区:从湍流对色散关系

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摘要

Using measurements from Cluster-II space mission, we compared the characteristics of the fluctuations of the magnetic field magnitude and the Bz component in the current disruption (CD) regions. We used fast Fourier transform, statistical, and wavelet analysis, and wave surveyor technique on the multispacecraft measurements. Among the obtained results one can note the presence of spectral breaks in both the magnetic field magnitude and the Bz component at frequencies smaller or equal to the proton gyrofrequency. The numerical values of the spectral index for the magnetic field magnitude and for the Bz component are similar, and the nature of the turbulent processes is close to that of the homogeneous magnetohydrodynamic (MHD) (the spectral index varies from -2.00 to -1.31) on the large time scale and resembles Hall-MHD (the spectral index varies from -2.33 to -2.99) on the smaller time scales. The kurtosis results are consistent with those of the spectral analysis. From wavelet technique, we detected powerful Pc4 and Pi1 pulsations, along with cascade features both for the magnetic field magnitude and for its z-component. The dispersion ratios also indicate the presence of nonlinear energy cascade processes in CD regions. We have found that the pulsations observed for magnetic pressure are also present in thermal proton and electron pressures although their powers differ considerably. For the dynamic helium and oxygen pressures, and also for the thermal pressures of these components, only pulsations in the high-frequency region are revealed.
机译：利用Cluster-II太空任务的测量,我们比较的特点磁场的大小和波动热组件在当前中断(CD)地区。统计,小波分析和波验船师在multispacecraft技术测量。可见光谱的磁场大小和Bz组件频率较小或等于质子旋转频率。光谱指数磁场大小和Bz组件是相似的,湍流的本质过程接近均匀的磁流体动力(磁流体动力)(光谱指数从-2.00到-1.31不等)在大时间尺度和Hall-MHD相似(光谱指数从-2.33到-2.99不等)在更小的时间尺度。与光谱相一致分析。强大的Pc4和软件脉动,以及级联特性对磁场大小和z分量。率也表明非线性的存在在CD地区能量级联过程。发现脉动观测磁也存在于热质子和压力电子压力虽然他们的力量是不同的很大。压力,也热的压力这些组件,只有脉动高频区域。

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