We study an eruptive X1.1 circular-ribbon flare on 2013 November 10, combining multiwavelength observations with a coronal field reconstruction using a non-force-free field method. In the first stage, a filament forms via magnetic reconnection between two mildly twisted sheared arcades, which are embedded under the fan dome associated with a null point. This reconnection seems to be driven by photospheric shearing and converging flows around the inner two arcade footpoints, consistent with the flare-related changes of transverse field. The southern portion of the filament rises upward due to torus instability and pushes against the null point. The induced null point reconnection then generates the circular ribbon and the initial remote brightening in the west, as accelerated electrons precipitate along the fan and propagate outward along quasi-separatix surfaces with high values of the squashing factor (Q) in the envelope fields, which have a curtain-like shape here. In the second stage, the southern end of the flux rope breaks away from the surface, sequentially disrupts the dome and overlying fields, and erupts in a whipping-like fashion to become a partial halo coronal mass ejection. This leads to an enhanced flare emission and fast-moving remote brightenings at the footpoints of the magnetic curtain, which span a remarkably broad region and are also associated with coronal dimmings. This is a rare example of eruptive circular-ribbon flares, in which the evolution of a flux rope from its formation to successful eruption out of the dome and the resulting unusually extended remote brightenings are completely observed.

中文翻译：

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具有扩展远程亮度的爆发性圆形带状耀斑

我们研究了 2013 年 11 月 10 日爆发的 X1.1 圆形带状耀斑，将多波长观测与使用非自由场方法的日冕场重建相结合。在第一阶段，通过两个轻度扭曲的剪切拱廊之间的磁性重联形成细丝，这些拱廊嵌入与零点相关的风扇圆顶下方。这种重新连接似乎是由内部两个拱廊脚点周围的光球剪切和会聚流驱动的，这与横向场的耀斑相关变化一致。由于环面不稳定，灯丝的南部向上上升并推向零点。诱导的零点重新连接然后在西部产生圆形带和初始远程增亮，随着加速电子沿着扇形沉淀并沿着具有高压缩因子 (Q) 值的包络场中的准分离面向外传播，此处具有幕状形状。在第二阶段，磁力绳的南端脱离地表，依次扰乱穹顶和上覆场，并以鞭打状喷发，成为部分晕日冕物质抛射。这导致磁幕脚点处的耀斑发射增强和快速移动的远程增亮，其跨越了非常广泛的区域，并且还与日冕变暗有关。这是喷发的圆形带状耀斑的罕见例子，