Overview
- NOAA data show the geomagnetic storm, which began on January 19, briefly eased then returned to G4 intensity, with no significant damage reported so far.
- A concurrent solar radiation storm reached S4, a level not seen since 2003, posing risks to astronauts, satellites and polar aviation while remaining harmless to people on the ground.
- The disturbance was driven by a fast coronal mass ejection tied to an X1.9 solar flare on January 18 that traveled roughly 1,000–1,400 km/s and reached Earth in about 25 hours.
- Widespread auroras were observed at unusually low latitudes across Europe, including Italy, with potential visibility also noted for parts of the United States.
- Authorities continue to monitor for disruptions to power grids, high‑frequency radio and satellite navigation as NOAA expects gradual weakening through the day.