Fig. 1.

Observed photospheric magnetic field that drives our simulation. We show the line-of-sight magnetogram from 16 August 2014 at 23:30:48 UT of active region AR 12139 observed with HMI on board of SDO. The temporal evolution of this magnetogram is used as input for the photospheric magnetic field in the simulation, see Sect. 2. The small square indicates a region of interested where a compact loop is observed, see Sects. 3 and 4.
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