Wave intensity spectra obtained with CSA (left column) and SOLPACS (right column) for ϵ_inj = 1.62 × 10^-5 at distance x = 0.0035 R_⊙ (top row) and x = 0.13 R_⊙ (bottom row) in front of the shock at t = 580 s. The filled blue and red circles in the SOLPACS data plots denote wave intensities of Alfvén waves of the opposite circular polarization. In all plots, coloured dashed lines show spectral indices and black dashed line shows the initial spectrum, normalized to provide λ = 1 R_⊙ for 100 keV protons.