Figure 4.
For SolarFLAG synthetic data with the BiSON duty cycle, sign-reversed fractional power change in the band from 2445 to 3940 |$\mu$|Hz relative to the mean over Solar Cycle 23. Spectra are from 64-d time series for dates before 1992 and 365-d series thereafter, (left) as a function of time and (right) as a function of RF, with the points colour-coded by year. The dashed lines in each panel represent a linear fit to the Cycle 23 RF, with slope 0.12 per cent per RFU.