Figure 4
Logarithm of the small-scale magnetic energy Ξb2 as a function of τ for ξi= 1/Rm. The upper, long dashed curve corresponds to the presence of 
, while the lower, oscillating one corresponds to the absence of those flows, both of them for Rm= 2000. Short dashed curves represent the same quantities but for Rm= 200. In this case, large-scale flows strongly enhance the production of small-scale magnetic energy, and this effect is again stronger for larger values of Rm.
