论文标题
虹膜观察中的黑子轻桥以上的各种活动：分类和比较
Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
论文作者
论文摘要
轻桥（LBS）是黑子中最引人注目的子结构之一，在界面区域成像光谱仪（IRIS）中，最近的高分辨率观察结果揭示了各种活动。根据各种物理特性，我们将这些活动分为四个不同的类别：瞬态亮度（TB），间歇性喷射（IJ），I型灯壁（LW-I）和II型轻壁（LW-II）。在IRIS1400/1330Å的观测值中，TBS的特征是突然增强，IJS在某些LB位点的宽度为1-2 mm的准直血等离子体出现。大多数观察到的TBS与IJS相关，并在C II和SI IV系的增强和宽阔的翅膀上显示某些色球吸收线的叠加，这可以由低大气中的间歇性磁重新连接驱动。 LW-I和LW-II是壁式结构，在整个LB上方具有明亮的前沿。 LW-I具有连续的振荡前线，典型的高度为几毫米，几乎固定的时间为4-5分钟。相反，LW-II具有缩进的前部，高度超过10毫米，其周期没有稳定，并且伴随着整个LB中的经常性TBS。这些结果支持LW-II是由于大规模的磁通量出现或侵入而不是沿整个LB进行的频繁重新连接所驱动的，而不是产生LW-IS的波浪的泄漏。我们的观察结果揭示了由不同基本物理过程驱动的LBS上方活动的高度动态场景，包括磁磁，磁重新连接和波浪泄漏。
Light bridges (LBs) are among the most striking sub-structures in sunspots, where various activities have been revealed by recent high-resolution observations from the Interface Region Imaging Spectrograph (IRIS). According to the variety of physical properties, we classified these activities into four distinct categories: transient brightening (TB), intermittent jet (IJ), type-I light wall (LW-I), and type-II light wall (LW-II). In IRIS 1400/1330 Å observations, TBs are characterized by abrupt emission enhancements, and IJs appear as collimated plasma ejections with a width of 1-2 Mm at some LB sites. Most observed TBs are associated with IJs and show superpositions of some chromosphere absorption lines on enhanced and broadened wings of C II and Si IV lines, which could be driven by intermittent magnetic reconnection in the lower atmosphere. LW-I and LW-II are wall-shaped structures with bright fronts above the whole LB. An LW-I has a continuous oscillating front with a typical height of several Mm and an almost stationary period of 4-5 minutes. On the contrary, an LW-II has a indented front with a height of over 10 Mm, which has no stable period and is accompanied by recurrent TBs in the entire LB. These results support that LW-IIs are driven by frequent reconnection occurring along the whole LB due to large-scale magnetic flux emergence or intrusion, rather than the leakage of waves producing LW-Is. Our observations reveal a highly dynamical scenario of activities above LBs driven by different basic physical processes, including magneto-convection, magnetic reconnection, and wave leakage.
