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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