Morphology of Twisted Flux Ropes and Plasma Motions in a Prominence-Cavity System Observed From Two Opposite Viewpoints

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
P. T. Jain Jacob, Ram Ajor Maurya
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Abstract

We investigate the three-dimensional structures of a prominence-cavity system from two distinct vantage points. For this purpose, we have used the observations recorded by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory and the Extreme Ultraviolet Imager (EUVI) on board the Solar Terrestrial Relations Observatory - Ahead (STEREO-A). Our analysis reveals that the prominence-cavity system was formed by the emergence of two oppositely rotating magnetic structures from the photosphere. The cavity, identified as an intensity-depleted region located above the prominence, was surrounded by horn-like structures. These prominence-horns, observed by both observatories, unveiled the presence of twisted flux ropes within the cavity. As the system evolved, we observed the prominence horns undergoing repeated upward motion accompanied by multiple instances of downward plasma motions. These observations suggest the occurrence of magnetic reconnection processes within the prominence-cavity system. We tracked the dynamics of these plasma motions in details, estimating their average speeds, physical parameters including the temperature, magnetic field, and the plasma density. In its final stage, the structure exhibited positive helicity, with left-bearing barbs that reflected the twisted flux rope morphology of the prominence. Our findings indicate that the prominence-cavity system was non-eruptive due to the presence of oppositely directed twist and writhe, which helped to conserve it's helicity.

从两个相反的角度观察日珥-空洞系统中扭曲通量绳的形态和等离子体运动
我们从两个不同的有利位置研究了日珥-空洞系统的三维结构。为此,我们使用了太阳动力学观测站上的大气成像组件和前方日地关系观测站(STEREO-A)上的极紫外成像仪(EUVI)记录的观测数据。我们的分析表明,日珥-空穴系统是由光球中出现的两个相反旋转的磁结构形成的。该空洞位于日珥上方,被认为是一个强度下降的区域,周围环绕着角状结构。两个天文台都观察到这些日珥角,揭示了黑洞中存在扭曲的通量绳。随着系统的发展,我们观察到日珥角经历了反复的向上运动,伴随着多次向下的等离子体运动。这些观测结果表明在日珥-空穴系统中存在磁重联过程。我们详细地跟踪了这些等离子体运动的动力学,估计了它们的平均速度、物理参数包括温度、磁场和等离子体密度。在其最后阶段,结构呈正螺旋状,左侧倒刺反映了日珥的扭曲通量绳形态。我们的研究结果表明,日珥洞系统没有爆发,因为存在相反方向的扭曲和扭动,这有助于保持它的螺旋度。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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