论文标题
观察地球磁尾中的重新连接喷气机中惯性范围的能量级联
Observation of Inertial-range Energy Cascade within a Reconnection Jet in Earth's Magnetotail
论文作者
论文摘要
地球的磁尾区为研究等离子体湍流提供了独特的环境。我们研究了磁磁尾区域在磁重新连接产生的排气中产生的湍流。磁性和速度光谱显示出与惯性范围相对应的宽带波动，kolmorogov $ -5/3 $缩放表明湍流式级联反应。我们检查混合的三阶结构函数，并在惯性范围内获得线性缩放。三阶结构函数的线性缩放意味着通过惯性范围的尺度不变的能量级联。政治上的三阶分析对不可压缩的能量转移速率的估计为$ \ sim 10^{7}〜\ mathrm {j \，kg^{ - 1} \，s^{ - 1}} $。这比通常在1 Au太阳风中测量的值高四个数量级，这表明湍流级联对于在尾部区域重新连接事件期间的能量耗散途径起重要作用。
Earth's magnetotail region provides a unique environment to study plasma turbulence. We investigate the turbulence developed in an exhaust produced by magnetic reconnection at the terrestrial magnetotail region. Magnetic and velocity spectra show broad-band fluctuations corresponding to the inertial range, with Kolmorogov $-5/3$ scaling, indicative of a well developed turbulent cascade. We examine the mixed, third-order structure functions, and obtain a linear scaling in the inertial range. This linear scaling of the third-order structure functions implies a scale-invariant cascade of energy through the inertial range. A Politano-Pouquet third-order analysis gives an estimate of the incompressive energy transfer rate of $\sim 10^{7}~\mathrm{J\,kg^{-1}\,s^{-1}}$. This is four orders of magnitude higher than the values typically measured in 1 AU solar wind, suggesting that the turbulence cascade plays an important role as a pathway of energy dissipation during reconnection events in the tail region.
