Run A1: return of residual energy to equilibrium after increasing the magnetic energy by a factor four in run A at time t = 10. One-dimensional reduced spectra and time evolution of modes k = 8,16,32 (solid, dotted, and dashed lines, respectively): a) total energy, compensated by k− 5/3; b) residual energy normalized by the α = 1 solution evaluated at time t = 12; c) residual energy and the analytical solution with short damping time (thin lines, cf. Eq. (18) with ); and d) same as c) but with tD = tNL for the analytical solution.
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