Overview
- Germany’s weather service (DWD) attributed widespread auroras to a geomagnetic storm strong enough for sightings from northern states to the Alps.
- NOAA classified the event at G4, a level that can disrupt satellites, degrade GPS accuracy, hinder high‑frequency radio and, in some cases, stress power systems.
- Observers reported intense red and green curtains visible even over major cities such as Berlin, with numerous sightings across Brandenburg, Saxony, Lower Saxony and NRW.
- Spaceweather reported the coronal mass ejection reached Earth in about 25 hours, unusually fast compared with the typical three to four days.
- A KP index near 8.3, cited by monitoring apps and specialist portals, indicated one of the strongest storms of the current solar cycle, though urban light pollution limited visibility in some areas.