A powerful solar outburst is likely to trigger a "severe" geomagnetic storm on Thursday, with auroras potentially visible as ...

NOAA's Space Weather Prediction Center (SWPC) said that the severe (G4) geomagnetic storm could affect the power grid, as ...

A geomagnetic storm​ is expected to trigger the northern lights, or aurora borealis, around NYC and New Jersey this week.

Parts of Minnesota, Wisconsin, Washington and several other states in the Lower 48 were treated to a beautiful aurora show Monday night amid a "severe" (G4) geomagnetic storm. Charged particles ...

A major solar storm is barreling its ... storm will be a strong “G3-class geomagnetic storm” — the third most powerful category after the G4 and G5. Geomagnetic storms are caused by ...

The global geomagnetic storm on May 10 was predicted to be a G4, but it reached G5 strength. NOAA predicts geomagnetic storm conditions may continue through Tuesday, Sept.17, though space weather ...

A powerful G4 geomagnetic storm ... classifies geomagnetic storms using a G-scale that measures their intensity, ranging from G1 for minor storms to G5 for the most extreme ones.

According to the SWPC, the “major disturbance in Earth’s magnetic field” was expected to reach G4 strength. The SWPC uses a five-point scale to categorize a geomagnetic storm’s strength.