论文标题
泰勒微观和有效的雷诺数来自PSP的太阳附近
Taylor microscale and effective Reynolds number near the Sun from PSP
论文作者
论文摘要
泰勒微观是湍流中的基本长度尺度，代表流体特性的末端和耗散过程的发作。泰勒微观也可用于评估经典湍流理论中的雷诺数。尽管太阳风较弱地碰撞，但在比动力学尺度大的尺度上大致表现为磁性水力动力学（MHD）流体。结果，经典的流体湍流理论和形式主义通常用于研究MHD范围内的湍流。因此，可以使用泰勒微观来估计太阳风中的有效雷诺数。 NASA的Parker Solar Probe（PSP）比以前任何其他航天器都逐渐靠近太阳。收集到的数据显示了近太阳太阳风中的许多新发现。在这里，我们使用PSP数据来估计泰勒微观和太阳附近的有效雷诺数。我们发现，与相应的近地值相比，泰勒微观和雷诺数的数量很小，这表明太阳风被湍流较少处理，在太阳附近，耗散过程非常小。
The Taylor microscale is a fundamental length scale in turbulent fluids, representing the end of fluid properties and onset of dissipative processes. The Taylor microscale can also be used to evaluate the Reynolds number in classical turbulence theory. Although the solar wind is weakly collisional, it approximately behaves as a magnetohydrodynamic (MHD) fluid at scales larger than the kinetic scale. As a result, classical fluid turbulence theory and formalisms are often used to study turbulence in the MHD range. Therefore, a Taylor microscale can be used to estimate an effective Reynolds number in the solar wind. NASA's Parker Solar Probe (PSP) has reached progressively closer to the Sun than any other spacecraft before. The collected data have revealed many new findings in the near-Sun solar wind. Here, we use the PSP data to estimate the Taylor microscale and effective Reynolds number near the Sun. We find that the Taylor microscale and Reynolds number are small compared to the corresponding near-Earth values, indicating a solar wind that has been less processed by turbulence, with very small-scale dissipative processes near the Sun.
