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Table 1.
Summary of EUV spectral line enhancements for M- and X-class flares. Values are percent increases relative to pre-flare background.
| EUV Line | Typical Enhancement (%) | Extreme Enhancement (%) | ||
|---|---|---|---|---|
| M-class | X-class | M-class | X-class | |
| He II 30.4 nm | 0.3–15 | 0.8–40 | ∼30 | 65–78 |
| Lyα 121.6 nm | 0.5–5 | 0.1–7 | 27 | 10–12 |
| Mg II | 0.1–2 | 0.1–3 | 2.5 | 4–5 |
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