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Enhancement of a sunspot light wall with external disturbances View all abstracts by submitter

Shuhong Yang   Submitted: 2016-11-30 21:39

Based on the 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 p-mode from below the photosphere, but may also be enhanced by external disturbances, such as falling material.

Authors: Shuhong Yang, Jun Zhang, Robert Erdélyi
Projects: IRIS,SDO-AIA,SDO-HMI

Publication Status: Accepted for publication in ApJL
Last Modified: 2016-12-14 13:55
Go to main E-Print page  Multi-instrument observations of a failed flare eruption associated with MHD waves in a loop bundle  The 26 December 2001 Solar Eruptive Event Responsible for GLE63. II. Multi-Loop Structure of Microwave Sources in a Major Long-Duration flare  Edit Entry  Download Preprint  Delete Entry 

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