SUBSIDING STORM: Earth's magnetic field is still reverberating from a CME strike on August 5th that sparked one of the strongest geomagnetic storms in years. Registering 8 on the 0 to 9 "K-index" scale of magnetic disturbances, the storm at maximum sparked auroras across Europe and in many northern-tier US states. Travis Novitsky sends this picture from Grand Portage, Minnesota:
"For an hour and a half the sky was filled with dancing lights, some of the best I've ever seen in Northern Minnesota!" says Novitsky.
The storm is subsiding now, but it could flare up again as gusty solar wind continues to buffet Earth's magnetic field. High-latitude sky watchers should remain alert for auroras.Aurora alerts: text, voice.