Enhancement of a sunspot light wall with external disturbances

Abstract

Based on the \emph{Interface Region Imaging Spectrograph} observations, we study the response of a solar sunspot light wall to external disturbances. A flare occurrence near the light wall caused material to erupt from the lower solar atmosphere into the corona. Some material falls back to the solar surface, and hits the light bridge (i.e., the base of the light wall), then sudden brightenings appear at the wall base followed by the rise of wall top, leading to an increase of the wall height. Once the brightness of the wall base fades, the height of the light wall begins to decrease. Five hours later, another nearby flare takes place, a bright channel is formed that extends from the flare towards the light bridge. Although no obvious material flow along the bright channel is found, some ejected material is conjectured to reach the light bridge. Subsequently, the wall base brightens and the wall height begins to increase again. Once more, when the brightness of the wall base decays, the wall top fluctuates to lower heights. We suggest, based on the observed cases, that the interaction of falling material and ejected flare material with the light wall results in the brightenings of wall base and causes the height of the light wall to increase. Our results reveal that the light wall can be not only powered by the linkage of \emph{p}-mode from below the photosphere, but may also be enhanced by external disturbances, such as falling material.

arXiv comment6 pages, 5 figures, accepted for publication in ApJL

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• The chromosphere above a $\delta$-sunspot in the presence of fan-shaped jets
• Observations of upward propagating waves in the transition region and corona above Sunspots
• Sunspot Light Walls Suppressed by Nearby Brightenings
• Sunspot penumbral filaments intruding into a light bridge and the resultant reconnection jets
• Signatures of the impact of flare ejected plasma on the photosphere of a sunspot light-bridge
• Small-scale Bright Blobs Ejected from a Sunspot Light Bridge
• Various Activities above Sunspot Light Bridges in IRIS Observations: Classification and Comparison
• Standing MHD Waves in a Magnetic Slab Embedded in an Asymmetric Magnetic Plasma Environment: Surface Waves
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