Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acasn..47..166z&link_type=abstract
Acta Astronomica Sinica, vol. 47, no. 2, p. 166-174
Astronomy and Astrophysics
Astronomy
1
Sun: Activity, Sunspots, Sun: Radio Radiation
Scientific paper
The wavelet technique is used to analyze the periodicities of the monthly average solar flux at 2800MHz, sunspot numbers, and sunspot areas. Our results show: (1) A common period of monthly average sunspot numbers, sunspot areas, and solar flux at 2800MHz around 10.69 years appears prominently. (2)The wavelet spectrum provides continuous temporal evolution of the entire rang of periods and gives detailed information on the time localization of frequency component,the periodicity of Solar activity less than one year is prominent periodicity only at the period of solar activity maximum. (3) The temporal evolution of wavelet powers corresponding to a few selected periods of 155.5 days, 5.11 years, and 10.69 years in sunspot numbers, sunspot areas, and radio flux at 2800MHz reveals that the wavelet powers of shorter-period oscillations evolve rapidly compared to that of long-period oscillations. The curve of wavelet powers of Rsn, Rsa and Rsf in the periods 155.5 days,5.11 and 10.69 years are very similar, having almost same fluctuations and the peaks of wavelet powers appearing almost at same times.
He Juan-Mei
Ye Yuan-Ling
Zhan La-Sheng
Zhao Hai-Juan
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