X5 flare and aurora
NOAA 4274 produced its 4th and -so far- strongest X-class event on 11 November. A series of CMEs may cause strong to severe geomagnetic conditions over the next 2 days. There's a small chance for aurora over Belgium.
news
X-class flareS!
Active region NOAA 4274 (SIDC Sunspot Group 687), the return of the flare-productive NOAA 4246, has just produced its THIRD X-class flare. ***UPDATED (3)***
ICAO Space Weather User Workshop
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.
Mighty NOAA 4246
NOAA 4246 (SIDC 639) started to develop on 10 October and produced over two dozen medium-class solar flares in just 9 days.
Progress of SC25
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).
Coronal holes do it again!
The combined high-speed solar wind stream from 2 coronal holes affected the earth environment from 30 September onwards.
The EUI team has become millionaires!
September 2025. The space instrument EUI onboard the spacecraft Solar Orbiter, took its millionth solar picture. Congratulations!
Deceptive
On the confusing appearance of sunspot region NOAA 4216 (SIDC 621).
A supersized coronal hole
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.
Long-duration geomagnetic storms
A few words and context on (very) long duration geomagnetic storms.