发表机构
Department of Physics, University of Ioannina（约阿尼纳大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过三维电阻MHD模拟，研究带有非均匀扭缠的浮现通量管的磁通量抵消，发现其产生多极结构、抵消率达1.1×10^19 Mx hr^-1，内部通量抵消可重构磁场并驱动爆发喷流。
AI 中文摘要
通量浮现常伴随通量抵消，这可能驱动太阳大气中的动力学现象。我们研究了带有非均匀扭缠轮廓的浮现通量管的三维电阻磁流体力学（MHD）模拟中的磁通量抵消，通过求解时变电阻MHD方程来模拟通量向磁化背景大气的浮现。我们识别出多个抵消位点，估算了它们的抵消率，并研究了磁拓扑结构及相关喷流活动。非均匀扭缠产生了多个相反的光球极性，形成了复杂的多极磁结构而非简单的偶极结构。内部次级磁区之间的相互作用导致光球B_z沿其极性反转线（PIL）发生通量抵消，这些相互作用形成了上凹环，抵消率达1.1×10^19 Mx hr^-1。抵消过程中，会聚相反极性之间的磁重联逐渐在抵消区上方形成连贯的磁通量绳，该通量绳的演化与爆发喷流相关，因为通量绳膨胀并将部分储存的扭缠释放到上方日冕中。我们还研究了光球高度处的两个较小次级抵消事件。我们的结果强调了内部通量抵消在重构磁场和驱动浮现区爆发喷流活动中的作用。
英文摘要
Flux emergence is often accompanied by flux cancellation, which may drive dynamic phenomena in the solar atmosphere. We studied magnetic flux cancellation in a three-dimensional resistive magnetohydrodynamic (MHD) simulation of an emerging flux tube with a non-uniform twist profile. We solved time-dependent resistive MHD equations to model flux emergence into a magnetised background atmosphere. We identified several cancellation sites, estimated their cancellation rates, and examined the magnetic topology and associated jet activity. The non-uniform twist produced multiple opposite photospheric polarities, leading to a complex multipolar magnetic configuration rather than a simple dipolar structure. Interactions between inner secondary magnetic patches resulted in flux cancellation of the photospheric $B_z$ along their polarity inversion line (PIL). These interactions led to the formation of concave-up loops and a cancellation rate of $1.1 \times 10^{19}$ Mx hr$^{-1}$. During cancellation, magnetic reconnection between converging opposite polarities progressively created a coherent magnetic flux rope above the cancellation region. The evolution of the rope was associated with a blowout jet, as the rope expanded and released part of its stored twist into the overlying corona. We also examined two smaller secondary cancellation events at photospheric heights. Our results highlight the role of internal flux cancellation in restructuring the magnetic field and driving blowout-jet activity in emerging regions.
Comments15 pages, 15 figures, accepted for publication in Astronomy & Astrophysics
DOI：10.1051/0004-6361/202661285
