标题： 小喷发日珥中磁场重联喷流的直接观测与CME触发 显示英文标题

标题： Direct Observations of Magnetic Reconnection Outflow and CME Triggering in a Small Erupting Solar Prominence

摘要： 我们研究了一次发生在2014年5月1日01:35 UT的小型日珥爆发事件，该事件由界面区域成像光谱仪（IRIS）和太阳动力学观测台（SDO）上的大气成像组件（AIA）观测到。日出前和日出后图像由Hinode的X射线望远镜（XRT）拍摄。 日出前，在日珥上方存在一个穹顶状结构，由日冕雨划定。 随着爆发的进行，我们发现日珥磁场与上方磁场之间存在重新连接的证据。 AIA和IRIS中观察到快速流动，表明存在重新连接流出。 AIA 171 Å通道中观察到~300 km s$^{-1}$的视平面流沿可能重新连接的磁力线。 IRIS检测到与AIA流一致的间歇性快视向流，速度约为~200 km s$^{-1}$。 微分发射度计算显示快流起源处有加热现象。 日出后XRT图像显示热环，可能是由于爆发期间磁场重新配置以及这些环中随后的等离子体加热引起的。 尽管有证据表明日珥上方在爆发过程中发生重新连接，但IRIS的高空间分辨率图像揭示了日珥下方潜在的重新连接位点。 爆发日珥的高度-时间分析显示初始上升缓慢，速度约为~0.4 km s$^{-1}$，随后快速加速，最终速度达到~250 km s$^{-1}$。 在这两个阶段过渡期间，IRIS中的增亮现象表明快速爆发的触发机制更可能是系绳切断机制而非突破机制。 显示英文摘要

摘要： We examine a small prominence eruption that occurred on 2014 May 1 at 01:35 UT and was observed by the Interface Region Imaging Spectrometer (IRIS) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). Pre- and post-eruption images were taken by the X-Ray Telescope (XRT) on Hinode. Pre-eruption, a dome-like structure exists above the prominence, as demarcated by coronal rain. As the eruption progresses, we find evidence for reconnection between the prominence magnetic field and the overlying field. Fast flows are seen in AIA and IRIS, indicating reconnection outflows. Plane-of-sky flows of ~300 km s$^{-1}$ are observed in the AIA 171 A channel along a potentially reconnected field line. IRIS detects intermittent fast line-of-sight flows of ~200 km s$^{-1}$ coincident with the AIA flows. Differential emission measure calculations show heating at the origin of the fast flows. Post-eruption XRT images show hot loops probably due to reconfiguration of magnetic fields during the eruption and subsequent heating of plasma in these loops. Although there is evidence for reconnection above the prominence during the eruption, high spatial resolution images from IRIS reveal potential reconnection sites below the prominence. A height-time analysis of the erupting prominence shows a slow initial rise with a velocity of ~0.4 km s$^{-1}$ followed by a rapid acceleration with a final velocity of ~250 km s$^{-1}$. Brightenings in IRIS during the transition between these two phases indicate the eruption trigger for the fast part of the eruption is likely a tether-cutting mechanism rather than a break-out mechanism.