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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.

NOAA 3615 finally did it!

NOAA 3615 produced its first X-class flare late on 28 March. ***UPDATE: The associated CME has no earth-directed component.***

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

NOAA 3599's spectacular eruption

Active region NOAA 3599 had already rotated over the Sun's west limb when it produced a spectacular long duration C-class flare.

Slowly but surely

The polar field reversal on the Sun is ongoing, but it is not completed yet as testified by observations.

Colourful curtains

A moderate geomagnetic storm was observed on 3 March. Polar lights were photographed as far south as mid-England and Lower Saxony in Germany.

Wuthering Heights

So far this solar cycle, NOAA 13590 is the largest sunspot group and it has produced the strongest solar flare. Some perspective.

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.

A stunning eruption

A stunning double eruption took place near the northeast solar limb on 12 February.

An X-class flare for breakfast

NOAA 3576 unleashed a powerful X2.5 flare on 16 February at 06:53 UTC.

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