Open Access
Table 1.
Definition of Regional Warning Center Japan’s operational solar flare forecast.
Code | Word | Flare class | 1–8Å X-ray flux: F (Wm−2) |
---|---|---|---|
0 | Quiet | B or lower | F <10−6 |
1 | Eruptive | C | 10−6 ≤ F < 10−5 |
2 | Active | M | 10−5 ≤ F < 10−4 |
3 | Major flare | X | 10−4 ≤ F |
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