Vertical cross section of the currrent density volume. The cross section, indicated with the blue line in Fig. 5, is shown for a) the stable model S, at iteration step 40 000, and then for model U at different iteration steps b)–d). a) The X-crossing of some current structures indicates the presence of an HFT. For the unstable model U, the traces of the flux rope, surrounded by the thick current layer area, can be seen as it lifts up at iteration n = 40 000b). At that point, the flux rope passes through the null point at n = 55 000c) and disappears, leaving coronal loop arcades underneath the null point X-structure at n = 70 000d).
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