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arXiv 2202.01874physics.space-phastro-ph.SRphysics.plasm-ph
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膨胀太阳风中的间歇性:帕克太阳探测器(0.16 au)、太阳神1号(0.3- 1 au)和旅行者1号(1- 10 au)的观测

Intermittency in the Expanding Solar Wind: Observations from Parker Solar Probe (0.16au), Helios 1 (0.3-1au), and Voyager 1 (1-10au)

Manuel Enrique Cuesta, Tulasi N. Parashar, Rohit Chhiber, William H. Matthaeus

摘要:

我们研究统计的磁场矢量分量,探讨如何从近太阳等离子体的径向距离大到10 au的不稳定性演变。进入分析的统计数据包括自相关、n阶磁结构函数(SFn)和尺度相关峰度(SDK),每个都在日心距离范围内分组。戈达德太空飞行中心的空间物理学数据设施(SPDF)提供了磁场测量,帕克太阳探测器的分辨率为6.8毫秒,太阳神号为6秒,旅行者1号为1.92秒。我们计算SF 2以确定包含惯性范围的尺度,并检查SDK以调查非高斯性程度。自相关用于解决相关尺度。相关长度和离子惯性长度提供有效雷诺数(Re)的估计。Re的变化使我们能够第一次研究行星际等离子体中SDK和Re之间的关系。从这种观察到的关系得出的结论是,在固定的物理尺度下,具有较低Re的区域平均具有较低的峰度,这意味着较少的间歇性行为。将Kolmogorov改进的相似性假设应用于磁SFn和峰度,以计算惯性范围内的非线性参数和分形标度。一个完善的旅行者1号磁场数据集生成。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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