Periodicities of solar irradiance and solar activity indices.

Details Periodicities of solar irradiance and solar activity indices. Periodicities of solar irradiance and solar activity indices.

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..129..165p&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 129, Sept. 1990, p. 165-189. Research supported by NOAA.

Physics

82

Solar Activity Effects, Solar Magnetic Field, Solar Radiation, Solar Rotation, Ultraviolet Radiation, Fast Fourier Transformations, Solar Cycles, Time Series Analysis

Scientific paper

The present FFT time-series analysis indicates the presence of an 8-11 month periodicity in solar total and UV irradiances, sunspot-blocking function, 10.7-cm radio flux, and Ca-K plage index. While the 51-day period is the dominant one in the projected areas of developing complex sunspot groups, it is missing from the old, decaying sunspot areas, thereby suggesting that the 51-day period is related to the emergence of new magnetic fields. A strong 13.5-day period is also found in the total irradiance and projected areas of developing complex groups. The modulation of various solar data due to the 27-day solar rotation is more prominent during the declining than the rising phase of the solar cycle.

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