| SURPRISE GEOMAGNETIC STORM (G3-CLASS) |
| SURPRISE GEOMAGNETIC STORM (G3-CLASS) https://www.solarham.net/oval.htm Earth's magnetic field was supposed to be quiet on April 10th. Instead a strong (G3-class) geomagnetic storm broke out. At the apex of the disturbance, auroras crossed the Canadian border into multiple northern-tier US states. Ron Risman sends this time-lapse movie from Milton, New Hampshire: |