May 2024. Sunspot group AR 3664 fired a barrage of CMEs at Earth over three days, and they arrived on top of each other. This is the strongest storm in twenty years, replayed from the measured archive.
A single fast CME makes a storm. Several in a row make a superstorm, because each one sweeps the path clear for the next. Watch the later wedges catch the earlier ones. That pile-up is what hit Earth.
Play from stop 1 and pause the moment the first wedge reaches Earth's orbit. Read the clock. When did the storm arrive?
Aurora was photographed from Mexico, Florida and northern India. GPS-guided tractors stopped in the US Midwest. The storm's full story, with sources, is on the Gannon event page.