Time evolution of the magnetic energies and helicities. Top panel: evolution of the total magnetic energy (E_tot, black lines), potential magnetic energy (E_pot, blue lines), and free magnetic energy (E_free, red lines) in the non-eruptive (dashed lines) and in the jet-producing (continuous lines) simulations. Bottom panel: evolution of the total relative magnetic helicity (H_V, black lines), non-potential magnetic helicity (H_j, red lines), and volume-threading magnetic helicity (H_pj, blue lines), in the non-eruptive (dashed lines) and in the jet-producing (continuous lines) simulations.