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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