Structure of chromosphere and corona above the flux cancellation site. Joule heating (top panel), up- and downflows in and around the current sheet (center panel), and magnetic field lines surrounding and above the current sheet. The green field lines in the lower panel outline the original ambient field that has been pushed upward and compressed by the emerging field (purple field lines) that is oriented largely in the y-direction (front to back in the figure). Below this field, we find a newly emerged field, drawn in red and blue to mark positive and negative B_z. The reconnection site driving the EB and UV burst is evident in the center of each panel. Reconnection heats and accelerates the plasma. Center panel: isosurfaces of 100 km s⁻¹ (cyan) upward flows and −60 km s⁻¹ downward (purple) flows. Beige, brown, and green in the upper panel show the intensity of the Joule heating.