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Temporal variation of the ratio between the monthly mean F10.7 flux and a constant proxy relation (4th-order polynomial) (upper panel), after subtracting a 67 sfu quiet-Sun base flux. The same ratio for the yearly mean F10.7 flux is shown in the lower panel. The points near cycle maxima and minima are colored in blue and red respectively. The monthly means show a slight solar-cycle modulation, and both curves show the 1980 jump between two stable periods.
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