Solar Orbiter’s total magnetic field power spectra density (top panel) and magnetic comressibility C_B (bottom panel) as a function of frequency upstream and downstream of the shock. The red and turquoise lines represent the upstream and downstream Fourier spectra using the Blackman-Tukey method. The red and green dots represent the corresponding Morlet wavelet results. Each spectrum is calculated in a 77-min interval upstream and downstream, respectively. Black straight lines in the top panel show power-law fits, and vertical dashed lines indicate the upstream and downstream proton cyclotron frequency in the plasma frame f_cu, f_cd and in the spacecraft frame , .