B_rms determined from the most quiet patches from 2010 to 2022 at disk center. The patches of 15° size in longitude and latitude contain network and internetwork fields. The solid red lines display the 97% percentile level, the dashed gray line the mode of a log-normal fit to yearly-binned data moved in a sliding window of 100 days length. For all values of ω, the magnitude of P is always an order of magnitude higher than the noise level outside the considered location of the ring.