Réka M. Winslow, Camilla Scolini, Noé Lugaz, Nathan A. Schwadron, Antoinette B. Galvin
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引用次数: 0
摘要
日冕物质抛射(Coronal mass ejection, cme)为日球层提供封闭的磁通量,其两端与太阳相连,在增加日球层磁通量方面起着关键作用。在这里,我们讨论了打开日冕物质抛射场线的磁重联类型,即交换(IC)和/或行星际(IP)重联,如何决定日冕物质抛射对日球层通量预算的贡献时间长度。在过去估计日冕物质抛射通量开启时间尺度的研究中,没有考虑到这一区别。我们概述了关键标准,以帮助区分基于原位航天器数据的IC重连接和IP重连接,并通过两个示例事件强调这些标准。研究日冕物质抛射在日球层内部重新连接和打开的方式,不仅可以了解日冕物质抛射在日球层通量收支中的作用,还可以了解日冕物质抛射复杂性、连通性和拓扑结构的演变。
On the Contribution of Coronal Mass Ejections to the Heliospheric Magnetic Flux Budget on Different Time Scales
Abstract Coronal mass ejections (CMEs) contribute closed magnetic flux to the heliosphere while they are connected at both ends to the Sun and play a key role in adding magnetic flux to the heliosphere. Here, we discuss how the type of magnetic reconnection that opens CME field lines in the inner heliosphere, i.e., interchange (IC) and/or interplanetary (IP) reconnection, determines the length of time CMEs contribute to the heliospheric flux budget. This distinction has not been taken into account in past studies that estimate the CME flux opening timescale. We outline key criteria to aid in distinguishing IC reconnection from IP reconnection based on in situ spacecraft data and highlight these through two example events. Studying the manner in which CMEs reconnect and open in the inner heliosphere yields important insights not only into CMEs’ role in the heliospheric flux budget but also the evolution of CME complexity, connectivity, and topology.
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.