Power spectra of frequency fluctuation at different solar offsets. The spectra at 4.9–69.9 Rs have a near-power-law shape close to that of the Kolmogorov spectrum in a frequency range [νlo, νup]. The noise dominates the spectra when ν > νup. Data from 2017 July 29 and August 3 were obtained by the local correlation. The PRIDE approach was used on all the rest.