Visualisation of a simulated magnetic flux transient. Displayed here are four instances of a small flux emergence event within a granule. The surface covers an area of 3 Mm × 3 Mm. Each snapshot is about 37 s apart. The grayscale image shows the vertical component of the magnetic field near the photosphere. The solid curves trace the magnetic field in the 3D domain. Each field line is color coded with the vertical component of the Poynting flux. See Sect. 3 for details.