Space Climate
Open Access

Fig. 2

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A comparison of the time series of the Standard aa data ((ftp://.ngfc.noaa.gov/STP/SOLARDATA/REALTED_INDICES/AA_INDEX/AA_YEAR) (points) and the Lockwood data (stars; priv. comm., 2009). The line at the bottom of the figure is the difference between the two time series.

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