Magnetic field lines (black) and out of plane electric field (colour) for a) the initial conditions of the MHD simulation, and b) the chosen snapshot into which test particles are injected. We present only the subset of the MHD simulation domain which is within the test particle computational box. Panel c: areas where current density exceeds the threshold value for triggering anomalous resistivity and coincides with the region where scattering takes place. Panel d: evolution of the magnetic energy in the simulation, with the red star indicating the time at which the snapshot used for the particle simulation is taken.