标题： 一次涉及外部重联的失败日冕物质抛射观测 显示英文标题

标题： Observations of a Failed Solar Filament Eruption Involving External Reconnection

摘要： 我们报告了一次失败的太阳暗条爆发，该过程涉及四极磁结构中的外部磁重联。 这一演化过程表现出三个动力学演化阶段：缓慢上升阶段、加速阶段和减速阶段。 在早期的缓慢上升阶段，极端紫外（EUV）亮化现象出现在预期的磁位形顶点上方的暗条之上，并通过高温环路与外部极性相连，表明爆发式重联的发生。 随后，暗条向外加速运动，伴随低矮高温耀斑环的形成（$>$ 15 MK），符合标准耀斑模型。 然而，在2到3分钟后，爆发的暗条开始减速，并最终被限制在日冕内。 重要发现是，这种限制与外部重联密切相关，这由高架的大尺度高温环（$>$ 10 MK）的形成所证明，这些环的亮点位于外部极性上，暗条的破碎以及沿新形成的大型环路的下落，以及靠近外部亮点之一的硬X射线源。 我们提出，尽管初始的突破重联和随后的耀斑重联启动并加速了暗条的爆发，但由于向上爆发的磁通量绳与上方磁场之间的后续外部重联，使此次爆发最终失败，这一点得到了失败磁通量绳爆发数值模拟的支持。 显示英文摘要

摘要： We report a failed solar filament eruption that involves external magnetic reconnection in a quadrupolar magnetic configuration. The evolution exhibits three kinematic evolution phases: a slow-rise phase, an acceleration phase, and a deceleration phase. In the early slow rise, extreme-ultraviolet (EUV) brightenings appear at the expected null point above the filament and are connected to the outer polarities by the hot loops, indicating the occurrence of a breakout reconnection. Subsequently, the filament is accelerated outward, accompanied by the formation of low-lying high-temperature post-flare loops ($>$ 15 MK), complying with the standard flare model. However, after 2--3 minutes, the erupting filament starts to decelerate and is finally confined in the corona. The important finding is that the confinement is closely related to an external reconnection as evidenced by the formation of high-lying large-scale hot loops ($>$ 10 MK) with their brightened footpoints at the outer polarities, the filament fragmentation and subsequent falling along the newly formed large-scale loops, as well as a hard X-ray source close to one of the outer footpoint brightenings. We propose that, even though the initial breakout reconnection and subsequent flare reconnection commence and accelerate the filament eruption, the following external reconnection between the erupting flux rope and overlying field, as driven by the upward filament eruption, makes the eruption finally failed, as validated by the numerical simulation of a failed flux rope eruption.