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Table 3.
Sample size, mean lead time, 95% confidence intervals, range, and standard deviation of EUV emission peak times relative to the SXR peak for M- and X-class flares.
| EUV Line | Parameter | M-class | X-class |
|---|---|---|---|
| He II 30.4 nm | N | 888 | 49 |
| Average lead time (min) | 4.09 ± 0.28 | 4.69 ± 1.74 | |
| 95% CI (min) | [3.81, 4.37] | [2.95, 6.43] | |
| Range (min) | 1–42 | 1–41 | |
| SD (min) | 4.33 | 6.20 | |
| Lyα 121.6 nm | N | 883 | 49 |
| Average lead time (min) | 4.90 ± 0.35 | 4.98 ± 1.29 | |
| 95% CI (min) | [4.55, 5.25] | [3.69, 6.27] | |
| Range (min) | 1–42 | 1–19 | |
| SD (min) | 5.28 | 4.59 | |
| Mg II index | N | 865 | 45 |
| Average lead time (min) | 4.75 ± 0.35 | 5.5 ± 1.9 | |
| 95% CI (min) | [4.40, 5.10] | [3.6, 7.3] | |
| Range (min) | 1–46 | 1–38 | |
| SD (min) | 5.31 | 6.45 | |
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