Intermittency in Interplanetary Coronal Mass Ejections Observed by Parker Solar Probe and Solar Orbiter

Julia Ruohotie, Simon Good, Christian Möstl and Emilia Kilpua
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Abstract

Intermittency has been studied extensively in the fast and slow solar winds but to a far lesser extent in interplanetary coronal mass ejections (ICMEs). While ICMEs are often characterized by their relatively smooth, large-scale magnetic flux rope structures, a spectrum of fluctuations is nonetheless present at smaller scales. We have examined kurtosis and its scaling exponents at magnetohydrodynamic inertial scales in 49 ICMEs observed between 0.25 and 1 au by Parker Solar Probe and Solar Orbiter, and compared the results to those obtained for the ICME sheath regions and ambient solar wind intervals. Kurtosis behaves similarly in all intervals studied and presents a universal behavior typical of intermittent time series. The ICMEs displayed a radially invariant level of intermittency, suggesting that they are relatively static, well-developed turbulent environments. In the sheath regions, the level of intermittency increased with distance, indicating that the turbulence is not yet fully developed at small heliocentric distances. In addition to intermittent fluctuations related to turbulence, the sheath regions may possess a population of nonturbulent structures that increase the absolute value of kurtosis.
帕克太阳探测器和太阳轨道器观测到的行星际日冕物质抛射的间歇性
间歇性已经被广泛地研究在快速和缓慢太阳风,但在行星际日冕物质抛射(ICMEs)的程度要小得多。虽然ICMEs的特点往往是其相对光滑的大尺度磁通绳结构,但在较小尺度上仍存在波动谱。我们研究了帕克太阳探测器和太阳轨道飞行器在0.25 ~ 1 au范围内观测到的49个ICME的峰度及其标度指数,并将结果与ICME鞘区和环境太阳风间隔的结果进行了比较。峰度在所研究的所有区间中表现相似,并呈现出间歇性时间序列的普遍特征。ICMEs表现出径向不变的间歇性水平,表明它们是相对静态的、发育良好的湍流环境。在鞘层区域,间断性水平随着距离的增加而增加,表明湍流在较小的日心距离上尚未完全发展。除了与湍流有关的间歇性波动外,鞘层区域还可能具有增加峰度绝对值的非湍流结构种群。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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