Panel a: light curve integrated over a small local region (∼48″ × 48″) in Hα line center (black) and the full-disk flux in SXR 1−8 Å (red) from 05:00 UT to 06:50 UT on 2015 October 16. The red vertical line indicates the onset of the M1.1 flare. Panels b and c: snapshots with a FOV of ∼48″ × 48″ at wavelengths of Hα 6562.8 Å and AIA 211 Å at about 05:30 UT, as indicated by the green line in panel a. The yellow dashed line outlines an ellipse profile. The whole evolution is shown in the online video, anim.mp4.
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