Projection views of the three field lines rooted in the footpoints F1, F2 and F3, plotted at selected times. Each field line is labeled according to its topology at the time that it is plotted, and is colored according to that of its footpoint as plotted in Fig. 3. The bottom planes show the double-J shaped current ribbons, seen as grayscale rendering of the vertical component of the electric current ȷz in the photosphere, with black-white standing for ȷz = ⟨ − 2.4; 3.2⟩. Panels a and b: field lines at the eruption onset at t = 164tA and at the end of the simulation at t = 244tA. Panels c–d (resp. e–f): field lines rooted in F2 and F1 (resp. in F2 and F3) before and after they endure one “aa–rf” (resp. one “rr–rf”) reconnection episode occurring at t = 223tA (resp. at t = 239tA). The bottom of the figure indicates which part of the QSL-footpoint (i.e., flare ribbon) evolution is associated with the kinds of reconnections being represented in the right columns.
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