Table 2
Linear correlation coefficients between mid-latitude range indices and the SuperMAG and auroral electrojet indices: r and r* are for 3-hourly values and the 8-point running means, respectively. The data used are for 1996–2017 (inclusive). This yields 61368 3-hourly samples (am, ap and aa) and 6136124 running-mean samples (Am*, Ap* and Aa*). For all correlations, the large number of samples ensures that the correlation significance level, derived by comparison with the AR1 red noise model, is 100% to within at least three decimal places for all cases. The maximum SME and minimum SML in each 3-hour intervals is SMEmax and SMLmin respectively.
| Interval (h) | am | ap | aa | ||
|---|---|---|---|---|---|
| SMEmax | 3 | r | 0.840 | 0.806 | 0.832 |
| 〈SME〉 τ=3h | 3 | r | 0.784 | 0.741 | 0.772 |
| AEmax | 3 | r | 0.824 | 0.767 | 0.815 |
| 〈AE〉 τ=3h | 3 | r | 0.784 | 0.741 | 0.772 |
| SMLmin | 3 | r | −0.823 | −0.777 | −0.807 |
| 〈SML〉 τ=3h | 3 | r | −0.792 | −0.748 | −0.779 |
| ALmin | 3 | r | −0.822 | −0.766 | −0.810 |
| 〈AL〉 τ=3h | 3 | r | −0.792 | −0.748 | −0.779 |
| Am* | Ap* | Aa* | |||
| SMEmax* | 24 | r* | 0.908 | 0.881 | 0.913 |
| 〈SME〉 τ=24h | 24 | r* | 0.866 | 0.826 | 0.864 |
| AEmax* | 24 | r* | 0.891 | 0.853 | 0.901 |
| 〈AE〉 τ=24h | 24 | r* | 0.856 | 0.826 | 0.864 |
| SMLmin* | 24 | r* | −0.890 | −0.867 | −0.867 |
| 〈SML〉 τ=24h | 24 | r* | −0.848 | −0.847 | −0.848 |
| ALmin* | 24 | r* | −0.900 | −0.865 | −0.865 |
| 〈AL〉 τ=24h | 24 | r* | −0.875 | −0.847 | −0.848 |
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