Levels of flare activity used in forecasting. The label and the wording occur in the daily bulletin. The flare class is the level defined to compare the forecasts to observations.
|Level number||Label||Wording||Flare class|
|1||<50% probability of C-class flares||Quiet conditions||B or lower|
|2||C-class flares expected, >50% probability||Eruptive conditions||C|
|3||M-class flares expected, >50% probability||Active conditions||M|
|4||X-class flares expected, >50% probability||Major flares||X|
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