Color-coded synthetic dynamic spectra of T-waves computed as in Fig. 9, but for τ = 1000 and as a function of the normalized wave frequency and delay time. The color scale represents the normalized wave intensity ${\mathcal{E}}_q^{\sigma T}\times {10}^7$. The first set of spectra (corresponding to that in Fig. 9) is generated by a beam moving along the radial direction with v_b = 8v_te in the interval t ≤ 20 s, as two narrow bands at (local) ω_pe and 2ω_pe. The second spectra is generated by the source ahead of a magnetic “blob” moving along radial direction with v_S/10 = 0.8v_te (with the beam propagating along magnetic field lines transverse to the radial direction). It extends from t ≃ 0 to t ≃ 250 s, and consists of a broadband curve at (local) 2ω_pe, accompanied by a thinner band which follows the same profile but at ω_pe. These two types of synthetic spectra are clearly similar to type III and type II emissions, respectively.