Figure 6

Dependences of the harmonic waves on the compressional intensity ratio to the background. The intensity ratio is obtained by dividing the compressional component of the wave intensity (C) by the square of the ambient magnetic field strength averaged over the corresponding FFT period (B₀ ²). Each color box represents the duration of the corresponding number of harmonics. The red boxes (# of harmonics = 1) indicate the narrowband fundamental waves without higher harmonics.