Open Access

Table 1.

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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