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Fig. 2


Run A. Energy spectra averaged during time interval 10 ≤ t ≤ 12. Wavenumbers are normalized by the dissipative wavenumber kd for which k2EM(k) is maximum; see text. a) From top to bottom: total, residual, magnetic, and kinetic energies, compensated resp. by k− 5/3, k-2, k− 5/3, k− 3/2. Spectra are arbitrarily shifted vertically. b) Normalized residual energy : (i) (solid) normalized by the α = 1 model (Eq. (7)); (ii) (dotted) normalized by the α = 2 model; (iii) (dashed) by the α = 1 model with the nonlinear time given by the advection time (see text).

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