Constraining Ion-Scale Heating and Spectral Energy Transfer in Observations of Plasma Turbulence.
Constraining Ion-Scale Heating and Spectral Energy Transfer in Observations of Plasma Turbulence.
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DOI：
10.1103/physrevlett.125.025102
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发表时间：
2020-07
影响因子：
8.6
通讯作者：
T. Bowen;A. Mallet;S. Bale;J. Bonnell;A. Case;B. Chandran;A. Chasapis;C. Chen;D. Duan
中科院分区：
文献类型：
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作者：
T. Bowen;A. Mallet;S. Bale;J. Bonnell;A. Case;B. Chandran;A. Chasapis;C. Chen;D. Duan
本文对帕克太阳探测器在近日点首次遭遇时观测到的惯性和动力学尺度的湍流功率谱进行了统计研究。我们发现，通常在离子动力学尺度之上的功率谱有一个非常陡峭的标度范围，类似于以前在1 A.U.的观测，幂律指数大约为-4。基于我们的测量，我们证明，无论是显着的（>50%）的总湍流能量通量的一部分被耗散在这个范围内的尺度，或湍流的特征非线性相互作用时间显着减少的期望仅基于非线性相互作用的动力阿尔文波的色散性质。
We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of the Parker Solar Probe. We find that often there is an extremely steep scaling range of the power spectrum just above the ion-kinetic scales, similar to prior observations at 1 A.U., with a power-law index of around -4. Based on our measurements, we demonstrate that either a significant (>50%) fraction of the total turbulent energy flux is dissipated in this range of scales, or the characteristic nonlinear interaction time of the turbulence decreases dramatically from the expectation based solely on the dispersive nature of nonlinearly interacting kinetic Alfvén waves.