a) Time series of E_M for U₀ = 0 and v_amp = 0, i.e. no wind or circulation, for 5 different values of Re_M. b) The corresponding plot with U₀ = 1, w = 0.3 and v_amp = 75. The time-averaged magnetic energy  ⟨ E_M ⟩ _t is calculated by time-averaging these time-series between the two dashed vertical lines. The other parameters used are α₀ = 16, w_α = 0.2, r₂ = 1.5, and w = 0.3.