The particle debris from this week’s monster X9-class solar flare hit Earth’s magnetic field last night.
The result: Northern Lights in the USA as far south as Arkansas. A severe (G4-class) geomagnetic storm on Sept. 8th sparked auroras so bright that, in parts of Scandinavia, traffic stopped as drivers pulled over to absorb the display. More storms are in the offing tonight and tomorrow as Earth moves through the wake of this potent CME.
Image by Chris Cook who writes: The aurora put in a nice display tonight despite the bright moonlight. Here they are reflecting in the calm waters off Cape Cod. The best view came around 9:30pm EDT when the Moon was still low in the SE sky. 10 second exposure at ISO4000 using a Canon 6D and Samyang 14mm f/2.8 lens.