太阳黑子光桥喷射出的小尺度亮斑
Small-scale Bright Blobs Ejected from a Sunspot Light Bridge
摘要：
光桥（LB）是明亮的通道，在一些太阳黑子中将本影分成多个部分。在界面区成像光谱仪（IRIS）的1400/1330 Ω ~通带中，通常在LB以上观测到温度为$\sim$ $10^5$ K的持续振荡亮锋。基于IRIS观测，我们报告了来自光桥上方振荡亮锋的小尺度亮斑。其中一些斑点显示出明显的加速度，而另一些则没有。这些斑点投射到天空平面上的平均速度为$71.7\pm14.7$ km s $^{-1}$，初始加速度为$1.9\pm1.3$ km s $^{-2}$。这些斑点通常到达距其原点3- 7毫米的投影距离。从过渡区图像中，我们发现斑点的平均投影面积为$0.57\pm0.37$ Mm $^{2}$。这些斑点也在太阳动力学观测站的多通带中被探测到，但在H $α$图像中没有。这些斑点很可能是等离子体喷射，我们研究他们的运动学和能量。通过发射测量分析，发现这些团的典型温度和电子密度分别约为$10^{5.47}$ K和$10^{9.7}$ cm $^{-3}$。估算的动能和热能分别为$10^{22.8}$ erg和$10^{23.3}$ erg的量级。这些小尺度的斑点似乎显示了三种不同类型的形成过程。它们可能分别由相邻激波相互作用引起的感应重联或增强的磁张力释放、光桥上出现的磁双极与周围单极本影场之间的局部磁重联以及向上激波引起的等离子体加速或不稳定性触发。
英文摘要：
Light bridges (LBs) are bright lanes that divide an umbra into multiple parts in some sunspots. Persistent oscillatory bright fronts at a temperature of $\sim$$10^5$ K are commonly observed above LBs in the 1400/1330 Å~passbands of the Interface Region Imaging Spectrograph (IRIS). Based on IRIS observations, we report small-scale bright blobs from the oscillating bright front above a light bridge. Some of these blobs reveal a clear acceleration, whereas the others do not. The average speed of these blobs projected onto the plane of sky is $71.7\pm14.7$ km s$^{-1}$, with an initial acceleration of $1.9\pm1.3$ km s$^{-2}$. These blobs normally reach a projected distance of 3--7 Mm from their origin sites. From the transition region images we find an average projected area of $0.57\pm0.37$ Mm$^{2}$ for the blobs. The blobs were also detected in multi-passbands of the Solar Dynamics Observatory, but not in the H$α$ images. These blobs are likely to be plasma ejections, and we investigate their kinematics and energetics. Through emission measure analyses, the typical temperature and electron density of these blobs are found to be around $10^{5.47}$ K and $10^{9.7}$ cm$^{-3}$, respectively. The estimated kinetic and thermal energies are on the order of $10^{22.8}$ erg and $10^{23.3}$ erg, respectively. These small-scale blobs appear to show three different types of formation process. They are possibly triggered by induced reconnection or release of enhanced magnetic tension due to interaction of adjacent shocks, local magnetic reconnection between emerging magnetic bipoles on the light bridge and surrounding unipolar umbral fields, and plasma acceleration or instability caused by upward shocks, respectively.
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