论文标题
离子尺度耗散和非线性相互作用的内螺层特征
Inner-Heliosphere Signatures of Ion-Scale Dissipation and Nonlinear Interaction
论文作者
论文摘要
我们对帕克太阳能探针的第一次围场相遇期间观察到的惯性和动力学尺度上的湍流功率谱进行了统计研究。我们发现，通常在离子运动尺度上方的功率谱的尺度范围非常陡峭，类似于1 AU的先前观察值，其幂律指数约为$ -4 $。根据我们的测量值，我们证明，在此范围内，总湍流通量的显着（$> 50 \％$）要么消散，要么在湍流的特征非线性相互作用时间急剧下降，这与预期的非线性相互作用性质基于非线性相互作用的Kinetic Kinetic Alfven Wave的期望。
We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of 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 AU, 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.
