Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
Yijun Hou, Ting Li, Shuhong Yang, Shin Toriumi, Yilin Guo, and Jun, Zhang

TL;DR
This study classifies and compares various dynamic activities above sunspot light bridges observed by IRIS, revealing different physical processes like reconnection, convection, and wave leakage responsible for these phenomena.
Contribution
It introduces a new classification scheme for activities above sunspot light bridges based on high-resolution IRIS observations, linking them to specific physical mechanisms.
Findings
Transient brightening associated with intermittent jets driven by magnetic reconnection.
Light walls exhibit oscillations or recurrent activity linked to different physical drivers.
Activities above light bridges are driven by diverse physical processes including reconnection and wave leakage.
Abstract
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 {\AA} 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…
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