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Same as Figure 2 for the aa geomagnetic index based on the 53327 daily means of aa, <aa>τ = 1 day, for 1868–2013 (inclusive). The additional blue line in (a) is the modelled Ap variation, as shown for Ap in Figure 4a, and the addition orange and blue lines are the two modelled estimates of f[Ap > Apo] shown for Ap in Figure 4b.
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