Are Switchback Boundaries Observed by Parker Solar Probe Closed?

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Nina Bizien, Thierry Dudok de Wit, Clara Froment, Marco Velli, Anthony W. Case, Stuart D. Bale, Justin Kasper, Phyllis Whittlesey, Robert MacDowall, Davin Larson
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Abstract

Abstract Switchbacks are sudden and large deflections in the magnetic field that Parker Solar Probe frequently observes in the inner heliosphere. Their ubiquitous occurrence has prompted numerous studies to determine their nature and origin. Our goal is to describe the boundary of these switchbacks using a series of events detected during the spacecraft’s first encounter with the Sun. Using FIELDS and SWEAP data, we investigate different methods for determining the boundary normal. The observed boundaries are arc-polarized structures with a rotation that is always contained in a plane. Classical minimum variance analysis gives misleading results and overestimates the number of rotational discontinuities. We propose a robust geometric method to identify the nature of these discontinuities, which involves determining whether or not the plane that contains them also includes the origin ( B = 0). Most boundaries appear to have the same characteristics as tangential discontinuities in the context of switchbacks, with little evidence for having rotational discontinuities. We find no effect of the size of the Parker spiral deviation. Furthermore, the thickness of the boundary is within MHD scales. We conclude that most of the switchback boundaries observed by Parker Solar Probe are likely to be closed, in contrast to previous studies. Our results suggest that their erosion may be much slower than expected.
帕克太阳探测器观察到的弯曲边界关闭了吗?
“反转”是帕克太阳探测器在日球层内频繁观测到的突然而巨大的磁场偏转现象。它们无处不在的存在促使了许多研究来确定它们的性质和起源。我们的目标是利用探测器第一次与太阳相遇时探测到的一系列事件来描述这些转换的边界。利用FIELDS和SWEAP数据,我们研究了确定边界法向的不同方法。观察到的边界是弧极化结构,其旋转总是包含在一个平面内。经典的最小方差分析给出了误导性的结果,并高估了旋转不连续的数量。我们提出了一种鲁棒的几何方法来识别这些不连续的性质,其中包括确定包含它们的平面是否也包括原点(B = 0)。大多数边界在切换的背景下似乎具有与切向不连续相同的特征,几乎没有证据表明存在旋转不连续。我们没有发现帕克螺旋偏差大小的影响。此外,边界的厚度在MHD尺度内。我们得出的结论是,与之前的研究相反,帕克太阳探测器观察到的大多数转换边界可能是关闭的。我们的结果表明,它们的侵蚀可能比预期的要慢得多。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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