Conditions sparked by the CMEs became so strong Monday night that the SWPC issued a “severe geomagnetic storm alert” around ...

Geomagnetic storms are harmless to humans but may cause disruptions and lasting impacts to satellites, technology, and communication means, prompting the NOAA to establish a risk scale. You can find ...

The storm reached a G4 level in strength — the second-highest on the scale, classified as “severe” — just before 11 a.m. Eastern Time. The geomagnetic storm conditions may continue into ...

The SWPC uses a five-point scale to categorize a geomagnetic storm’s strength ... problems,” throw off navigation systems, and impact high-frequency radio signals. The SWPC warned of such ...