As predicted, a CME hit Earth’s magnetic field at 0600 UT on March 17th. The impact sparked a moderately strong (Kp=6) geomagnetic storm that sent Northern Lights spilling across the Canadian border into the United States as far south as Colorado:
“Just after 4 am local time, the skies turned green and red behind the twin stone monoliths of Rabbit Ears Peak near Steamboat Springs,” reports photographer Jimmy Westlake, an astronomy professor at Colorado Mountain College.
In the contiguous United States, auroras also appeared above New York, Washington, Minnesota, Wisconsin, Wyoming, Michigan, the Dakotas and elsewhere. Scan the realtime photo gallery and count the states.