Magnetic configurations related to the coronal heating and solar wind generation. II. Quantitative characterization of active-region magnetic structure based on the geometric property of force-free α

IF 2.2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of Japan Pub Date : 2023-06-13 DOI:10.1093/pasj/psad035
Yeonwoo Jang, Sibaek Yi, T. Magara
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Abstract

We investigate the geometric property of a scalar position function, the so-called force-free α, to see how it quantitatively characterizes the magnetic structure of solar active regions, which is reminiscent of the electrostatic potential whose geometric property provides information on the structure of electrified objects. Scatter plots of (α, ∇2α) show characteristic shapes representing twisted magnetic field configurations in two model active regions, one of which is formed by an emerging magnetic flux tube composed of strongly twisted field lines while the other is formed by a weakly twisted flux tube. By generalizing the concept of an axis field line in a uniformly twisted cylindrical flux tube, we introduce a topological object called the principal field line to represent magnetic structure reconstructed using a force-free field model. The principal field line and associated scatter plot of (α, ∇2α) provide a method reminiscent of active-region radiography, which could be used for quantitative classification of active regions with those magnetic configurations responsible for heating coronal plasmas, generating solar winds, and producing potentially harmful coronal explosive phenomena.
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与日冕加热和太阳风产生有关的磁场结构。2基于无力α几何性质的有源区磁性结构定量表征
我们研究了标量位置函数的几何性质,即所谓的无力α,以了解它如何定量表征太阳活动区的磁结构,这让人想起静电势,其几何性质提供了带电物体结构的信息。(α,∇2α)的散点图显示了两个模型活动区域的特征形状,其中一个是由强扭场线组成的新兴磁通管形成的,另一个是由弱扭磁通管形成的。通过推广均匀扭曲圆柱形磁通管中轴向磁场线的概念,我们引入了一个称为主磁场线的拓扑对象来表示用无力场模型重建的磁结构。(α,∇2α)的主场线和相关散点图提供了一种类似于活动区域放射成像的方法,可以用于定量分类活动区域,这些磁场配置负责加热日冕等离子体,产生太阳风和产生潜在有害的日冕爆炸现象。
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来源期刊
Publications of the Astronomical Society of Japan
Publications of the Astronomical Society of Japan 地学天文-天文与天体物理
CiteScore
4.10
自引率
13.00%
发文量
98
审稿时长
4-8 weeks
期刊介绍: Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.
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