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Active region NOAA 4274 (SIDC Sunspot Group 687), the return of the flare-productive NOAA 4246, has just unleashed an X1 flare. ***UPDATED (1)***

On 20 October, ICAO -the International Civil Aviation Organization- organised a Space Weather User Workshop on the provision and use of space weather information for international civil air navigation. The STCE contributed significantly.

NOAA 4246 (SIDC 639) started to develop on 10 October and produced over two dozen medium-class solar flares in just 9 days.

The STCE's SC25 Tracking page has been updated to reflect the latest evolution of some critical space weather parameters for the ongoing solar cycle 25 (SC25).

The combined high-speed solar wind stream from 2 coronal holes affected the earth environment from 30 September onwards.

September 2025. The space instrument EUI onboard the spacecraft Solar Orbiter, took its millionth solar picture. Congratulations!

On the confusing appearance of sunspot region NOAA 4216 (SIDC 621).

The wind stream associated with a big coronal hole may trigger an increase in the number of highly energetic electrons in the satellite environment, thus posing a threat to satellite operations.

A few words and context on (very) long duration geomagnetic storms.

CoSEE-Cat is not an animal lounging on your couch but what is it then?