Northern Lights 2025 May 11. The biggest geomagnetic storm in two decades, sparked by solar flares, caused the aurora borealis to appear around stretches of the northern hemisphere where they rarely. [+] whitley bay on the north east coast of the u.k.
Northern lights illuminate the night sky north of san francisco in middletown, california on may 11, 2025. The g5 storm culminated in a remarkable display of the aurora.