Fig. 2.

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Evolutions of the prominence captured by EUV observations at 193 Å from 2021 February 8 to 10. Initially, on February 8, the prominence is observed at the southeast edge, exhibiting a twisted structure with a bridge-pier body (Panels a-e). The twisting neck of the prominence is indicated by the white arrows. From 18:10 UT on February 9, material starts to move upwards from the top of the prominence towards the north and the south, as shown by the black arrows in Panels (c-e). At 21:00 UT on February 10, the top twisted structure of the prominence begins to diminish, while a new dark arcade appears above the prominence, highlighted by the black double-head arrow in Panel (f). EUV intensity distributions along the slice “L1-L2”, as indicated in Panel (b), are depicted in Panel (h). The white winding lines labeled “1-4” highlight the twisting structures of the prominence around its axis. In the lower right corner, arrows “1-4” illustrate the decreasing angles between the twisting features and the prominence axis. The long PIL is depicted by the red dashed lines. The black box in Panel (c) represents the field of view of the Hα observations from NVST, as illustrated in Figure 3. An animation of corresponding EUV observations is available online.
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