Time evolution of the different gauge invariant terms of dH_j/dt (top panels), from left to right: dissipation term (dH_j/dt|_Diss, Eq. (9)), own term (dH_j/dt|_Own, Eq. (18)), and helicity transfer term (dH_j/dt|_Transf, Eq. (10)). Time evolution of the different gauge invariant terms of dH_pj/dt (bottom panels), from left to right: dissipation term (dH_pj/dt|_Diss, Eq. (20)), and own term (dH_pj/dt|_Own, Eq. (29)). Each curve color corresponds to a particular simulation: dispersion central (red line), dispersion peripheral (green line), stretching (yellow line), and convergence (blue line). The yellow band corresponds to the onset phase of the eruption.