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By using the daily averages of F 10.7 in 1956—2003 and adopting the method of Morelet wavelet transform, the characteristics of the quasi-27d oscillations and their relation with the 11-year cycle of solar activity are analyzed. The results demonstrate that the amplitude and period of the quasi-27d oscillations of F 10.7 exhibit obvious phenomena of short-tern variations. The degrees...
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