Earth's magnetic field is still reverberating from a CME strike on March 10th. During the past 24 hours, Northern Lights have descended as far south as Wisconsin, Minnesota, and Michigan in the United States. "It was nice to see the aurora borealis again after so many years of low activity," says Jerry Zhu, who sends this picture from Madison, WI:

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© Jerry Zhu
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© Travis Novitsky

Solar wind conditions favor more geomagnetic storming in the hours ahead. Sky watchers--even those in the continental United States--should remain alert for auroras.

More USA images: from Shawn Malone of Marquette, Michigan; from Duane Clausen of Menominee, Michigan; from Shawn Thompson of Two Harbors, Minnesota; from Travis Novitsky of Grand Portage, Minnesota; from Andrew Krueger of Duluth, Minnesota; from Dennis Zerwas Jr near Cambridge, Minnesota; from Bill Doms of Santiago, Minnesota; from Bob Conzemius of Grand Rapids, Minnesota; from Kristine Deppe near Cook, Minnesota; from Scott Anttila of Ishpeming, Michigan; from Dan Miller near Duluth, Minnesota.

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© WeatherPaparazzi.comJust north of St. Cloud, Minnesota, northern US, 11/03/2011