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NOAA 13615

Active region NOAA 13615 was one of the larger sunspot groups so far this solar cycle. During its transit, it produced 1 X-class flare and 43 M-class flares, the latter is an exceptionally high number.

Teamwork

A long-duration X1 flare was associated with the strongest proton event so far this solar cycle, as well as with an earth-directed full halo CME. ***UPDATED***

More X-class flares

NOAA 3590 produced 3 X-class flares in 24 hours: an X1.8 flare peaking late on 21 February, an X1.7 flare peaking early on 22 February, and an X6.3 event that peaked on 22 February at 22:34UTC. The latter is the strongest flare so far this solar cycle. ***UPDATED.***