论文标题
膨胀太阳风的间歇性:Parker太阳能探针(0.16AU),Helios 1(0.3-1AU)和Voyager 1(1-10AU)的观察结果
Intermittency in the Expanding Solar Wind: Observations from Parker Solar Probe (0.16au), Helios 1 (0.3-1au), and Voyager 1 (1-10au)
论文作者
论文摘要
我们检查了磁场矢量成分的统计数据,以探讨间歇性如何从近太阳等离子体演变为径向距离至径向距离为10 au。输入分析的统计数据包括自动相关,n(SFN)的磁性结构函数和比例依赖性峰度(SDK),每个峰值(SDK)以HeliePentric距离范围分组。 Goddard太空飞行中心空间物理数据设施(SPDF)为Parker太阳能探针的分辨率提供6.8ms的磁场测量,HELIOS的6s和Voyager 1的1.92s。我们计算SF2。我们计算SF2确定范围,以确定包含惯性范围的量表,并检查SDK以调查SDK以调查非统治程度。自动相关用于解析相关量表。相关长度和离子惯性长度提供了有效雷诺数(RE)的估计值。 RE的变化使我们能够首次检查行星际等离子体中SDK与RE之间的关系。这种观察到的关系的结论是,在固定物理尺度下具有较低RE的区域平均具有较低的峰度,这意味着间歇性行为较少。 Kolmogorov精制相似性假设应用于磁SFN和峰度,以计算惯性范围内的间歇性参数和分形缩放。生成了精制的Voyager 1磁场数据集。
We examine statistics of magnetic field vector components to explore how intermittency evolves from near sun plasma to radial distances as large as 10 au. Statistics entering the analysis include auto-correlation, magnetic structure functions of order n (SFn), and scale dependent kurtosis (SDK), each grouped in ranges of heliocentric distance. The Goddard Space Flight Center Space Physics Data Facility (SPDF) provides magnetic field measurements for resolutions of 6.8ms for Parker Solar Probe, 6s for Helios, and 1.92s for Voyager 1. We compute SF2 to determine the scales encompassing the inertial range and examine SDK to investigate degree of non-Gaussianity. Auto-correlations are used to resolve correlation scales. Correlation lengths and ion inertial lengths provide an estimate of effective Reynolds number (Re). Variation in Re allows us to examine for the first time the relationship between SDK and Re in an interplanetary plasma. A conclusion from this observed relationship is that regions with lower Re at a fixed physical scale have on average lower kurtosis, implying less intermittent behavior. Kolmogorov refined similarity hypothesis is applied to magnetic SFn and kurtosis to calculate intermittency parameters and fractal scaling in the inertial range. A refined Voyager 1 magnetic field dataset is generated.