Distributions of the wave spectral magnetic energy density log₁₀(∣B_zk(k_x, k_y)∣²) emitted around the frequency ω_k ≃ ω_p, for ΔN = 0.05 and the “large” simulation box of size ﹩{L}_{x}\times {L}_{y}=5792\times 2896{\lambda }_{D}^{2}﹩. The initial plasma density distribution is given in Figure 1. The spectra are shown at times ω_pt = 145, 680, 940, 1485, 2020, and 3100. A green circle of radius kλ_D ≃ k_thλ_D is superposed on the spectra at the first and last times. The same color bar holds for all plots. All variables are normalized.