Animation for "Rapid Evolution of Bald Patches in a Major Solar Eruption"

Animation of Figure 1 and 4 of Lee, Sun, & Kazachenko (2020), ApJL, "Rapid Evolution of Bald Patches in a Major Solar Eruption".

Animation 1. The animation (18 s, 88 frames) shows bald patch (BP) evolution from 10:49:30 UT to 13:00:00 UT. The background shows the positive (negative) polarity B_z in white (black). Vectors show B_h with foot points in the positive (negative) B_z in blue (red). The polarity inversion line (PIL) and BPs are shown by the green line and yellow/orange circles, respectively. The gray contour is for B_z = 300 G. The X9.3 flare has a GOES start, peak, and end time in soft X-ray flux at 11:53 UT, 12:02 UT, and 12:10 UT, respectively. Prior to the flare, Region 1 gradually built more BPs along the PIL. Throughout the duration of the flare and afterwards, BPs in Region 1 disintegrated. BPs in Region 2 largely remained the same and survived the flare. The large amount of pixel masking occurring in the central regions of the AR and extending into both polarities during the flare is an artifact of flare ribbons, leading to many masked pixels. It can be seen in more detail in the Animation 4.

Animation 4. The animation (18 s, 88 frames) shows the flare ribbon evolution from 10:49:30 UT to 13:00:00 UT. During the onset of eruption, ribbons developed along the PIL within Region 1 and exterior to the PIL in Region 2. Prior to the flare peak, flare ribbons propagated along and separated away from the PIL covering the entirety of Region 1 and Region 2.