The Wolf number and total solar irradiance variations during 21 23 solar cycles

Details The Wolf number and total solar irradiance variations during 21 23 solar cycles The Wolf number and total solar irradiance variations during 21 23 solar cycles

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26at...25..341k&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 25, Issue 4, p.341-345

Astronomy and Astrophysics

Astronomy

1

Sun, Wolf Numbers, Total Solar Irradiance, Wavelet Analysis.

Scientific paper

In this work, the numerical sequences of the total solar irradiance data and the corresponding values of the international sunspot index, both for the same time interval (about 25 years), are compared. The data are analysed by means of two methods: continuous wavelet transformation and Fourier spectrum decomposition. Special attention is given to short periods of approximately 27 days. It is shown that the 27 day periodicity, caused by rotation of the active regions, is demonstrated well in the Wolf number spectrum, while in the total solar irradiance spectrum a time interval of about 15 60 days is displayed. The peaks at about 1 year and the weaker quasibiennial peaks (2 2.5 years) are noticeable in both spectra.

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