Fig. 1.

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Overview of the twisted prominence observed on 2021 February 10. The prominence is situated at the southeast edge of the Sun, as indicated by white arrows in the EUV images at 211 Å (Panels a and d) and 304 Å (Panels b and e) around 03:35 UT. It is a component of a larger filament, as shown by a black arrow in Panel (c), which is a Hα image captured by HSOS at 03:36 UT. The dashed curves in Panels (a-b) depict the PIL that separates positive and negative flux patches. To highlight the twisted structure of the prominence, sub-images in the larger squares of Panels (a-c) are displayed in Panels (d-f). The cyan and yellow outlines represent positive and negative flux density at ±100 G, respectively. The long filament is indicated by dashed lines in Panels (a-b). The slanted squares in Panels (a, d) indicate the field of view of Hα observations from NVST.
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