Power spectra of the kinetic energy, the enstrophy, and the magnetic energy normalised by the total initial kinetic energy. Results are shown for both 2D and 3D MHD simulations with ℳ = 1, δ = 30, n_s = 0.01 cm⁻³. The spectra are plotted at different times in each panel. From left to right, the vertical black lines refer to length-scales of R_s, R_s/16, R_s/32, and R_s/64, the minimum cell size. For illustration, the power laws k^3/2, k^−5/3 and k⁻³ are shown by grey dotted, plain and dashed lines, respectively.