Geomagnetic storm reaches G3 levels after March 18 CME impacts Earth

A G3 - Strong geomagnetic storm developed late on March 20 into early March 21, 2026, after a coronal mass ejection that left the Sun on March 18 impacted Earth. The storm intensified after at least two CME arrivals, with solar wind speeds reaching 567 km/s and the interplanetary magnetic field turning strongly southward to −28 nT. Source