Temporal evolution of the physical parameters during a reconnection event seen in the flux-emergence simulations. Values are given on the solar surface (x, y) at two different heights: z₁ = −0.57 Mm and z₂ = −0.60 Mm, with z₂ being closer to the upper boundary of the simulation box. The location of the reconnection event is indicated by the squared box in Figs. 4 and 5. From top to bottom: T(x, y, z₂), logarithm of the square of the horizontal component of the electric current , vertical component of the velocity v_z(x, y, z₂) (v_z < 0 are upflows), B_x(x, y, z₁), B_x(x, y, z₂), B_y(x, y, z₁), and B_y(x, y, z₂). Arrow fields show the direction of the magnetic field on the (x, y) plane. The length of the arrows is proportional to . White contours correspond to those regions where T(z₂) > 4750 K, while black contours enclose regions where where j² units are A² m⁻⁴. The white horizontal line on the uppermost panel at y = y₁ = 8.1 Mm shows the slice that is used in Fig. 12.