论文标题
太阳活动对太阳风磁波动中泰勒量表和相关量表的影响
Effects of Solar Activity on Taylor Scale and Correlation Scale in Solar Wind Magnetic Fluctuations
论文作者
论文摘要
在2001年至2017年期间，使用高级组成资源管理器（ACE），风和群集航天器数据评估了相关量表和泰勒量表，从两点，单个时间相关函数中评估了行星际磁场的波动，从而涵盖了整个太阳能周期。将相关量表和泰勒量表分别与黑子数进行比较，以研究太阳能活动对等离子体湍流结构的影响。我们的研究表明，泰勒量表随着黑子数的增加而增加，这表明泰勒量表与能量级联速率呈正相关，而黑子数和泰勒量表之间的相关系数为0.92。但是，这些结果与流体动力耗散理论的传统知识不符。一种可能的解释是，在太阳风中，流体近似在耗散范围附近的空间尺度下失败。因此，传统的流体动力湍流理论对于描述太阳风湍流的物理性质是不完整的，尤其是在动力学耗散量表附近的空间尺度上。
The correlation scale and the Taylor scale are evaluated for interplanetary magnetic field fluctuations from two-point, single time correlation function using the Advanced Composition Explorer (ACE), Wind, and Cluster spacecraft data during the time period from 2001 to 2017, which covers over an entire solar cycle. The correlation scale and the Taylor scale are respectively compared with the sunspot number to investigate the effects of solar activity on the structure of the plasma turbulence. Our studies show that the Taylor scale increases with the increasing sunspot number, which indicates that the Taylor scale is positively correlated with the energy cascade rate, and the correlation coefficient between the sunspot number and the Taylor scale is 0.92. However, these results are not consistent with the traditional knowledge in hydrodynamic dissipation theories. One possible explanation is that in the solar wind, the fluid approximation fails at the spatial scales near the dissipation ranges. Therefore, the traditional hydrodynamic turbulence theory is incomplete for describing the physical nature of the solar wind turbulence, especially at the spatial scales near the kinetic dissipation scales.
