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Fig. 4

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Scatter plots of Apc as a function of normalised values (for the best fit α of 0.46) based on 1-hour resolution interplanetary data for 1964–2016. Po is the average of for all the available data from 1964–2016, and Apc are hourly Ap values (linearly interpolated from the observed 3-hourly Ap values) that are coincident with a valid hourly value. The blue dots are for daily means (τ = 1 day) and the red dots for annual means (τ = 1 year). The black line is the linear regression fit to the τ = 1 day data and gives the correlation C in Table 2, the red line is the linear regression fit to the τ = 1 year data and gives the correlation D in Table 2.

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