Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142..365b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 142, no. 2, p. 365-389.
Physics
41
Irradiance, Solar Activity, Solar Cycles, Solar X-Rays, Spectrum Analysis, Sunspot Cycle, Periodic Variations, Power Spectra, Solar Atmosphere, Solar Rotation
Scientific paper
The temporal characteristics of solar periodicities as regards background X-ray flux, 10.7 cm flux, several indices to UV chromospheric flux, total solar irradiance, projected sunspot areas, and sunspot blocking function are studied using dynamic power spectral analysis. The transitory nature of solar periodicities is demonstrated, including periods at 12-14, 26-28, 51-52, and approximately 154 days. Indices related to strong magnetic fields show the greatest variation in the number of periodicities, seldom persist for more than three solar rotations, and are highly variable in their frequency and amplitude. Periodicities found in the chromospheric indices are fewer, persist for up to 8-12 solar rotations, and are more stable in their frequency and amplitude. It is concluded that the solar data examined here are both quasi-periodic and quasi-stationary, with chromospheric indices showing the longest intervals of stationarity, and data representing strong magnetic fields showing the least stationarity.
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