Properties of the initial snapshot (t = 0 min). Panel A: horizontal averages of the initial stratification for temperature T (green), magnetic field strength B (black), pressure P (blue) and density ρ (red) normalized to their photospheric values at z = 0 Mm (T_ph = 5803 K, B_ph = 0.44 G, P_ph = 1.12 × 10⁵ erg cm⁻³, and ρ_ph = 3.20 × 10⁻⁷ g cm⁻³). The dotted vertical line delineates the solar surface. Panel B: 2D map for the initial background stratification of the temperature only showing values below T = 3 × 10⁴ K. The solar surface is roughly at z = 0 Mm (dashed horizontal black line). The other dashed line is an isocontour that delimits the transition region at T = 10⁵ K.