发表机构
University of Ioannina; Aristotle University（约阿尼纳大学; 亚里士多德大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过三维电阻磁流体动力学模拟，揭示喷发式磁通量浮现中电流片碎裂为间歇性片状耗散网络的过程，为脉冲式日冕加热提供自然机制。
AI 中文摘要
浮现磁通量与周围日冕磁场之间的磁重联从根本上驱动了太阳喷流。我们使用三维电阻磁流体动力学模拟来研究喷发式磁通量浮现，以探究在反复喷流活动期间，界面处形成的大尺度电流片如何碎裂。模拟表明，喷流形成与电流片破坏是单一多尺度过程的耦合要素。沿开放磁力线及喷流内部发展的电流结构相对较弱，主要呈现丝状形态。相比之下，与闭合磁场拓扑相关的较大结构明显更强，且浮现磁通的喷发式发展进一步增加了其数量与强度。闭合磁力线区域内的平行电流分布呈现高斯核心并伴有显著的非高斯尾部，这意味着存在一小部分强且间歇性的结构。磁谱在大尺度范围内遵循具有类柯尔莫哥洛夫斜率的幂律，在小尺度范围内则变得陡峭得多——这与重联介导的磁场结构化一致。盒计数分析表明，最强的电流结构具有分形维数$D_{\mathrm{f}} \simeq 2$，指示出片状相干结构的碎裂群体。聚类分析进一步揭示了簇体积及其欧姆耗散能量的宽幂律分布，单个事件在其估计寿命内达到$\sim 10^{20}$--$10^{25}$尔格。这些结果表明，喷发式磁通量浮现能够自洽地将全局重联电流片转化为局域化、间歇性、以片为主导的耗散网络，为脉冲式日冕加热提供了自然环境，并为未来的粒子加速研究提供了动力。
英文摘要
Magnetic reconnection between emerging magnetic flux and the ambient coronal field fundamentally drives solar jets. We use three-dimensional resistive-MHD simulations of eruptive flux emergence to investigate how the large-scale current sheet formed at the interface fragments during recurrent jet activity. The simulations show that jet formation and current-sheet disruption are coupled elements of a single multiscale process. The current structures developing along open field lines and within the jet are relatively weak, exhibiting a predominantly filamentary morphology. In contrast, the larger structures linked to the closed-field topology are noticeably stronger, and the eruptive development of the emerging flux further increases both their number and strength. The parallel-current distributions within the closed magnetic field lines region exhibit Gaussian central cores with pronounced non-Gaussian tails, implying a small subset of strong, intermittent structures. Magnetic spectra follow a power law with a Kolmogorov-like slope in the large-scale range, becoming much steeper in the small-scale range---consistent with reconnection-mediated magnetic structuring. Box-counting analysis shows that the strongest current structures have a fractal dimension $D_{\mathrm{f}} \simeq 2$, indicating a fragmented population of sheet-like coherent structures. Cluster analysis further reveals broad, power-law distributions of cluster volumes and their Ohmic dissipation energies, with individual events reaching $\sim 10^{20}$--$10^{25}$ erg over their estimated lifetimes. These results demonstrate that eruptive flux emergence can self-consistently transform a global reconnecting current sheet into a localized, intermittent, sheet-dominated dissipative network, providing a natural environment for impulsive coronal heating and motivating future particle-acceleration studies.
Comments15 pages, 8 figures
