Impact of decreasing electric field strength upon electric field trapping mechanism. An electron orbit (which initially is trapped between regions of strong, oppositely oriented electric field) continues to repeatedly mirror when the electric field strength is reduced by a factor of 10 (purple) and 100 (orange). a) shows the parallel component of electric field, E_||, experienced in each field strength case (see legend) while b) shows the corresponding changes in parallel velocity, v_||.