Time evolution of the upper small field of view (see Fig. 3d). Left column: vertical magnetic field map and the red arrows are the direction of the horizontal field. Middle column: temperature map at log τ₅₀₀ = −3. Right column: vertical cut of the temperature, the same cut as in Fig. 10. Every row corresponds to a different time step, the first row is the beginning of the observations, the second row the middle of the time series, and the last row the end of the observations.