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Table 3.
Auroral intersection (A ∩ B) between the Zhang-Paxton (A) and the Feldstein-Starkov (B) ovals as a function of Kp index. (A ∩ C) is the interception between (A) and the equatorward boundary of diffuse aurora from Starkov (1994a) (C). Q max is the maximum electron flux. Q min = 0.25 ergs cm−2·s−1.
| Kp | Auroral activity | Level | A ∩ B [%] | A ∩ C [%] | Q max [mW·m−2] |
|---|---|---|---|---|---|
| 0 | Minimum | Normal conditions | 32 | 99 | 1.65 |
| 1 | Quiet | 26 | 86 | 2.10 | |
| 2 | Low | 33 | 87 | 3.20 | |
| 3 | Moderate | 35 | 87 | 4.34 | |
| 4 | Active | 36 | 89 | 5.34 | |
| 5 | High | High activity levels | 35 | 88 | 6.45 |
| 6 | High + | 32 | 84 | 8.36 | |
| 7 | High ++ | 30 | 83 | 12.18 | |
| 8 | High +++ | 24 | 68 | 12.91 | |
| 9 | Maximum | 22 | 62 | 18.10 |
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