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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?

Never a dull moment with the Sun: impressive prominence eruptions and powerful solar flares took turns to give an impressive show of solar activity.

STCE researchers used a sophisticated wavelet-based algorithm to automatically detect and characterize thousands of transient EUV brightenings, often called campfires, in the HRIEUV data obtained at the closest-perihelion of Solar Orbiter.

NOAA 4168 (SIDC sunspot group 588) was one of the larger and more flare-active regions during the last few weeks. It produced no less than 17 M-class ("medium") flares, with a few quite spectacular.

Two very nice prominence eruptions were observed on 14 and 15 July. The associated CMEs were not earth-directed.

Twenty-five years ago, one of the most powerful solar storms of SC23 rocked geospace and affected a whole series of technologies.

Some impressive prominences erupted last week. None of the associated CMEs is directed to Earth.

Superactive regions represent less than 0.5% of all active regions during a solar cycle, yet they are the source of 30-45% of all X-class flares.