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(a) Daily (Sd, red color) and monthly smoothed (Sms, black color) sunspot number plotted as a function of time (in years). (b) The change in the daily sunspot number ΔS over the nine-day average is plotted as a function of time (in years) for SCs 10–23. (c) Variation of the mean solar magnetic field for SCs 21–23. (d) Variation of the F10.7 flux in units of 10−22 Wm−2 Hz−1 SCs 18–23.
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