SURPRISINGLY STRONG GEOMAGNETIC STORM: NOAA predicted a minor geomagnetic storm. It turned out to be strong instead. A co-rotating interaction region (CIR) hit Earth on May 29th, sparking a G3-class geomagnetic storm. CIRs are transition zones between fast- and slow-moving streams of solar wind. They contain CME-like shock waves that do a good job sparking geomagnetic storms and auroras.
https://spaceweather.com/
Ydun Ritz (2025-05-29)