Fig. 7From: The numerical simulation of the generation of lower-band VLF chorus using a quasi-broadband Vlasov Hybrid Simulation codeSpectrogram of simulation of VLF emission with N-shaped frequency–time profile. The equatorial linear growth rate is increased to a high-level 380db/s. The triggering wavefield is a strong key down doublet of amplitude 80pT, frequencies 2140 and 2340 HzBack to article page