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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. ***UPDATE: The ICME arrived shortly after noon on 24 March, sparking a severe geomagnetic storm.***

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.***