Ultraviolet Radiation Quasi-Periodicities and Their Possible Link with the Cosmic Ray and Solar Interplanetary Data

Figure 4

The spectra of the time series spanning from March 2015 to December 2022 (N  = 2580) for the daily mean values of (a) cosmic rays from the KACST muon detector, (b) Kp index, (c) radio flux at 10.7 cm (F10.7), and (d) solar wind speed (SWS). The horizontal lines are 50%, 90%, 95%, 99%, and 99.9% confidence levels.

(a)

(b)

(c)

(d)