Rotation of the Solar Corona from Observations of Radio and X-Ray Solar Emission for Solar Activity Cycles 22-24

The values of the radio and X-ray solar flux over the last three cycles of solar activity were studied for the presence of quasi-periodic oscillations via the construction of a combined spectral periodogram. The revealed quasi-periods are mainly caused by the modulation of prolonged radio and X-ray fluxes by the proper rotation of the Sun. Particular attention was paid to the study of the time variation of the quasi-periods over the solar cycles via the construction of a sample estimate of the normalized spectral density of the data in a moving time window of up to 2 years. The dynamic diagrams of the variations in the quasi-periods constructed in this manner indicate that the differential rotation of the solar corona manifests itself at individual stages of the development and existence of the last three cycles of solar activity.