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Scatter plots of the maximum value of the AE auroral electrojet index in 3 h intervals, AEmax, as a function of the homogeneous aa index value, aaH, from the same 3-hour interval. Plots are for three averaging timescales τ of both data series: (a) τ = 1 day (note that 〈aaH〉τ = 1 day is called AaH); (b) τ = 27 days and (c) τ = 1 year. Data are for 1995 to 2017 inclusive. In the middle panel, the data points have been colour-coded according to the difference in F between the centre of the 27-day interval and the closest June solstice, ΔF.
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