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NOAA 14366 has become the most flare-productive group of the ongoing solar cycle. In fact, it's already on the third place of groups producing the most M- and X-class flares since the start of the GOES measurements half a century ago!

On 19 January 2026, one of the strongest solar radiation storms of the last few decades took place. However, though the storm contained a large number of low-energy protons, the number of high-energy protons remained mostly at background levels. A few aspects of this event are discussed, and a crude reference is provided.

The magnetic cloud ("CME") associated with the strong flare late on 1 February produced by sunspot group 4366, arrived yesterday 4 February. It resulted in a -still ongoing- minor geomagnetic storm. For Belgium, this means no aurora are visible. Meanwhile, NOAA 4366 produced another strong X-class flare on 4 February. (***UPDATED 6***)

A concise analysis of the spectacular aurora that were observed during the 19-20 January geomagnetic storm.

Proba-3/ASPIICS captured three prominence eruptions in five hours during an active period on 21 September 2025.

The magnetic cloud (CME) associated with yesterday's X1 flare has already arrived. A severe geomagnetic storm is in progress. Spectacular aurora have been observed over Belgium.

NOAA 4341 produced a long-duration X1.9 flare during the late afternoon of 18 January. The associated coronal mass ejection is expected to impact the Earth's magnetic field on 20 January, possibly resulting in a major geomagnetic storm. Currently, a proton event is in progress.

Something not seen very often: a bipolar sunspot region with both main portions having the same magnetic polarity.

The first Proba-3 ASPIICS Guest Investigator call is now open, with a submission deadline of 12 February 2026. The GI programme offers access to Proba-3 ASPIICS data and the unique chance to participate in instrument commanding. 

Sunspot activity was quite variable during December 2025, with some large and complex sunspot regions at the beginning and end of the month.