A major disturbance on the sun's surface could result in a disruptive geomatic storm, the National Oceanic and Atmospheric Administration warns.
The so-called coronal mass ejection occurred last night, NOAA said, and the fall-out could have widespread impacts come tomorrow morning.
Already, according to NOAA, a related "radiation storm" has set off high-frequency radio blackouts at the Poles and in other regions.
Geomagnetic storms can affect electrical grids and radio and satellite telecommunications.
For more information, check out this site.