Temporal evolution of plasma properties in the source region of the plasma ejection. The panels show a) the Ohmic heating rate H_Ohm = μ₀ηj²; b) the work done by the magnetic field and c) the work done by the pressure gradient. Positive values in panels b) and c) imply that work is performed on the plasma, i.e., the kinetic energy of the plasma is enhanced. All values represent averages in a box spanning 2 Mm  ×  2 Mm horizontally and 1 Mm in height (cf. red box in right panels of Fig. 1).