Shock evolution within the emerged region for the Experiment 2 at different instants (rows). Left column: temperature, T, for the NEQ branch; middle column: T for the NEQ+AD case; and right column: characteristic time of the heating due to ambipolar diffusion, τ_qamb (see Eq. (9)). In addition, a solid line nearly perpendicular to the shock front has been superimposed in all the panels to study the variation of different quantities due to the shock passage (see Fig. 6). In the image, dashed lines indicate the location of the solar surface (line at z = 0 Mm) and of the transition region (isocontour at T = 10⁵ K). An animation of this figure is available online.