Temperature (left panels), plasma density (center panels), and plasma β (right panels) distributions in the (r,z) plane in log scale in the simulations B50-D11-Unif (upper panels) and B500-D11-Unif (lower panels) at the labeled times. The initial position of the transition region between the chromosphere and the corona is at z = 0 (dashed line). The initial magnetic field is uniform and oriented along the z-axis; the white lines mark magnetic field lines. The yellow arrows in the right panels map the velocity field.