Spacetime diagrams showing the azimuthal magnetic field at the top and the total stress at the bottom. The left figures shows the simulation with an artificial resistivity coefficient α_B = 0.5 and the right figures show the simulation with α_B = 4. The figures clearly show the peaks related to the continuous creation and destruction of channel modes. Increasing the resistivity leads to a suppression of small scale magnetic fluctuation, and this means that more of the stress will be generated by the mean-field component.