论文标题
多ribbon耀斑的磁性拓扑和喷发机制
The Magnetic Topology and Eruption Mechanism of a Multiple-ribbon Flare
论文作者
论文摘要
多右喇叭通常在其磁性拓扑和喷发机制中很复杂。在本文中，我们研究了X2.1火炬（SOL2015-03-11T16：22），该耀斑通过潜在的和非线性的无力场模型在太阳能磁盘中心附近发生，该模型均与Heliose震荡和磁成像器（HMI）在Solar Dynamics（Solar Dynamics of Board Dynamics（Soderics）上观察到的数据外推的数据）。我们计算三维挤压度分布。结果表明，该活性区域中有两个通量绳，被大规模双曲线管（HFT）覆盖，这是准分离层层与嵌入无效点的相交。当背景磁场由于西北偶极子的分离而减小，而磁通取消时，中央通量绳将升起，形成两个最亮的中央丝带。然后，它挤压上躺着的HFT结构以产生进一步的光亮。这种具有复杂形状的非常有活力的耀斑伴随着冠状质量弹出（CME）。我们采用当前环模型的简化线束线平衡方程，并将衰减索引的观察值分配给方程式，以模拟早期阶段CME的加速度曲线。发现从径向最佳的$ 45^\ circ $倾斜的路径最适合实际加速度的轮廓。
Multiple-ribbon flares are usually complex in their magnetic topologies and eruption mechanisms. In this paper, we investigate an X2.1 flare (SOL2015-03-11T16:22) that occurred in active region 12297 near the center of the solar disk by both potential and nonlinear force-free field models extrapolated with the data observed by the Helioseismic and Magnetic Imager (HMI) on board Solar Dynamics Observatory (SDO). We calculate the three-dimensional squashing degree distribution. The results reveal that there are two flux ropes in this active region, covered by a large scale hyperbolic flux tube (HFT), which is the intersection of quasi-separatrix layers with a null point embedded in it. When the background magnetic field diminishes due to the separation of the northwest dipole and the flux cancellation, the central flux rope rises up forming the two brightest central ribbons. It then squeezes the upper lying HFT structure to generate further brightenings. This very energetic flare with a complex shape is accompanied by a coronal mass ejection (CME). We adopt the simplified line-tied force-balance equation of the current ring model and assign the observed value of the decay index to the equation to simulate the acceleration profile of the CME in the early stage. It is found that the path with an inclination of $45^\circ$ from radial best fits the profile of the actual acceleration.
