On June 21, NASA’s Solar and Heliospheric Observatory (SOHO) captured this image of coronal mass ejection (CME). NOAA forecasters immediately issued aurora and geomagnetic storm alerts. Predictions of a 90% chance it would “catch up”, joining forces with 2 weaker CME eruptions from June 18 and 19 didn’t disappoint. Yesterday an impressive G4-class magnetic storm ignited auroras deep below the Canadian border.
Not over yet, the second image illustrates “auroral oval” over tonight’s northern hemisphere sky. NOAA predicts a 90% chance of widespread aurora activity June 23, diminishing slightly to 70% on June 24.
Meanwhile, sunspot AR2371 produced an impressive M6.5 flare credited with shortwave and low-frequency radio blackouts over North America. Click on the spaceweather link to learn more.
We tend to think of auroras as winter phenomenons, accustomed to images of northern lights skipping across frozen tundra. Don’t be fooled, stars have no seasons.