arXiv 0705.44302007-05-30astro-ph

太阳开放磁场的结构和动力学

Structure and Dynamics of the Sun's Open Magnetic Field

S. K. Antiochos, C. R. DeVore, J. T. Karpen, Z. Mikic

备注：: 26 pages, 6 figures
DOI：: 10.1086/522489

摘要：

太阳磁场是驱动太阳活动并将太阳耦合到日光层的主要因素。虽然这种耦合的细节取决于场的定量性质，但日冕-太阳风联系的许多重要方面可以通过只考虑太阳上场从光球层延伸到行星际空间的那些区域的一般拓扑性质来理解，这些区域通常被观测为日冕洞。从标准的准定常日冕风理论模型的基本假设出发，我们得到了两个关于冕洞可能的结构和动力学的假设：（1）冕洞是唯一的，因为光球层上的每个单极区域最多只能包含一个冕洞。(2)嵌套极性区域的冕洞必须是嵌套的。磁重联在加强磁场拓扑的约束方面起着核心作用。从这些aptutures，我们得到的开放领域的拓扑结构的附加属性，并提出了几个观测预测缓慢变化和瞬态日冕/太阳风。

英文摘要：

The solar magnetic field is the primary agent that drives solar activity and couples the Sun to the Heliosphere. Although the details of this coupling depend on the quantitative properties of the field, many important aspects of the corona - solar wind connection can be understood by considering only the general topological properties of those regions on the Sun where the field extends from the photosphere out to interplanetary space, the so-called open field regions that are usually observed as coronal holes. From the simple assumptions that underlie the standard quasi-steady corona-wind theoretical models, and that are likely to hold for the Sun, as well, we derive two conjectures on the possible structure and dynamics of coronal holes: (1) Coronal holes are unique in that every unipolar region on the photosphere can contain at most one coronal hole. (2) Coronal holes of nested polarity regions must themselves be nested. Magnetic reconnection plays the central role in enforcing these constraints on the field topology. From these conjectures we derive additional properties for the topology of open field regions, and propose several observational predictions for both the slowly varying and transient corona/solar wind.

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英文摘要：

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