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Modulus of the cross-coherence between three proxies (F10.7, MgII and SEM) and F30 (a), and F10.7 (b). Coloured bands correspond to a ±σ confidence interval. The 27-day and 13.5-day periods are indicated by dashed lines. The time intervals used for estimating the cross-coherence are proxy-dependent: solar cycles 20–24 for radio proxies, cycles 21–24 for the MgII index, and cycles 23 and 24 only for SEM. For that reason, the different cross-coherences are not strictly comparable.
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