Magnetic field lines taken from the global NLFFF evolutionary model showing the configuration of the magnetic field in the time period surrounding the eruption of the stealth event. Panels a–d: representative magnetic field lines of two flux ropes denoted by FR2 (blue lines) and FR3 (magenta lines), and also open field (green lines). These panels are plotted in the same co-rotating frame as Fig. 5 and the day of the simulation is given in the bottom left. For panels a–d the central meridian longitude is 13°, 0°, 347° and 334°, respectively. The blue (red) contours represent negative (positive) photospheric magnetic flux and the locations of ARs 12252, 12253, 12255, and the extended south pole coronal hole (CH) are given in the first panel. The same magnetic field lines are shown in the y − z plane in panels e–h.