论文标题
在轻桥中检测相反的磁极性：它的出现和取消与LB扇形喷气机相关
Detection of Opposite Magnetic Polarity in a Light Bridge: Its Emergence and Cancellation in association with LB Fan-shaped Jets
论文作者
论文摘要
轻桥（磅）是相对明亮的结构，将黑子遮阳布分为两个或更多部分。众所周知，色层LB与各种活动有关，包括风扇形喷射样弹出和亮度。尽管经常建议磁重新连接负责此类活动，但并没有多少研究提出了支持该方案的牢固证据。我们对LB进行磁场测量和成像光谱，其中扇形喷射样弹出发生在其脚步处的共同空间亮度。我们使用TIO图像，近红外成像光谱仪以及1.6〜M Goode太阳能望远镜获取的LB结构和磁场变化。我们检测到与黑子相反的LB中的磁通量出现。新的磁通量以5.6x10^18 mx/hr的速度取消了先前存在的通量。复发性射流弹出及其基本亮光均在取消磁通量的附近启动，并以高达18.4公里/s的预计速度显示出明显的水平延伸，以形成粉丝形的外观。基于这些观察结果，我们建议扇形弹出可能是由于LB中新的通量与环境黑子场之间的重新连接而产生的。
Light bridges (LBs) are relatively bright structures that divide sunspot umbrae into two or more parts. Chromospheric LBs are known to be associated with various activities including fan-shaped jet-like ejections and brightenings. Although magnetic reconnection is frequently suggested to be responsible for such activities, not many studies present firm evidence to support the scenario. We carry out magnetic field measurements and imaging spectroscopy of a LB where fan-shaped jet-like ejections occur with co-spatial brightenings at their footpoints. We study LB fine structure and magnetic field changes using TiO images, Near-InfraRed Imaging Spectropolarimeter, and Halpha data taken by the 1.6~m Goode Solar Telescope. We detect magnetic flux emergence in the LB that is of opposite polarity to that of the sunspot. The new magnetic flux cancels with the pre-existing flux at a rate of 5.6x10^18 Mx/hr. Both the recurrent jet-like ejections and their base brightenings are initiated at the vicinity of the magnetic flux cancellation, and show apparent horizontal extension along the LB at a projected speed of up to 18.4km/s to form a fan-shaped appearance. Based on these observations, we suggest that the fan-shaped ejections may have resulted from slipping reconnection between the new flux emerging in the LB and the ambient sunspot field.
