Fig. 3.
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Magnetic structure of the circular ribbon flare. Panels (a)–(b) show nonlinear force-free field (NLFFF) extrapolation in the Cartesian coordinates in two perspectives. Panels (c)–(d) show the distribution of the squashing degree log10Q in the black dashed boxes in panels a–b, respectively. Panel (d) displays a slice at a height of about 11 Mm from the bottom. Panels (e)–(f) show NLFFF extrapolation in spherical coordinates viewed in two perspectives. And the view shown in panel f corresponds to that observed by AIA.
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