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Emerging Dimming as Coronal Heating Episodes View all abstracts by submitter

Xudong Sun   Submitted: 2021-03-16 19:08

Emerging dimming occurs in isolated solar active regions (ARs) during the early stages of magnetic flux emergence. Observed by the Atmospheric Imaging Assembly, it features a rapid decrease in extreme-ultraviolet (EUV) emission in the 171 channel images, and a simultaneous increase in the 211 images. Here, we analyze the coronal thermodynamic and magnetic properties to probe its physical origin. We calculate the time-dependent differential emission measures for a sample of 18 events between 2010 and 2012. The emission measure (EM) decrease in the temperature range 5.7≤log T≤5.9 is well correlated with the EM increase in 6.2≤log T≤6.4 over eight orders of magnitude. This suggests that the coronal plasma is being heated from the quiet-Sun, sub-MK temperature to 1-2 MK, more typical for ARs. Potential field extrapolation indicates significant change in the local magnetic connectivity: the dimming region is now linked to the newly emerged flux via longer loops. We conclude that emerging dimming is likely caused by coronal heating episodes, powered by reconnection between the emerging and the ambient magnetic fields.

Authors: Anna V. Payne, Xudong Sun
Projects: SDO-AIA

Publication Status: ApJ (in press)
Last Modified: 2021-03-17 13:31
Go to main E-Print page  Effects of external flow on resonant absorption of coronal loop kink oscillations driven by an external fast wave: Selective excitation problem  Proxy-Based Prediction of Solar Extreme Ultraviolet Emission using Deep Learning  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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