Powerful farside eruption

Early on 13 March, a strong eruption occurred on the Sun's farside.

The STCE in 2021

The STCE Annual Report 2021 is now available online.

STCE's Number Puzzle

Some number crunching to highlight solar activity, projects and ongoing missions so far in SC25.

A new month, a new X-class flare!

A sunspot region near the northwest solar limb produced a new X-class flare on 3 March. The bulk of the associated CME is not earth-directed.

One active region, 2 M-class flares

Decaying active region NOAA 13229 produced 2 M-class flares. The associated CMEs had earth-directed components and caused a strong geomagnetic storm 2 days later.

More on the X2 flare

Some more clips of the X2 flare of 17 February 2023.

Mercury, a little black dot on the Sun

The telescope EUI onboard the satellite Solar Orbiter could capture Mercury while it transited the Sun. Scientists use the little black as a guide for science-approved photo-editing.

X2.2 flare

An X2.2 flare erupted from sunspot region NOAA 13229. The bulk of the associated coronal mass ejection is not directed to Earth. Updated.


On 7 February, a spectacular eruption took place near the Sun's east limb. It was accompanied by a significantly deflected coronal mass ejection.

X-class flare!

Active region NOAA 13217 produced a low-level X-class flare peaking at 15:48 UTC on 11 February.



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