The northern lights are expected to be visible across Alaska tonight and Thursday, with many other northern U.S. states also seeing tomorrow's display according to the University of Alaska Fairbanks.
, will be at four, indicating active displays. The scale goes all the way up to nine, and any occurrence above five is considered a geomagnetic storm.
The institute has also forecast auroral activity on Thursday for Oregon, Washington, Idaho, Montana, Wyoming, North Dakota, South Dakota, Minnesota, Wisconsin, Michigan, New York, New Hampshire, Vermont, Indiana, Maine and Maryland. On Thursday, the storm will get stronger and can be seen overhead in Minneapolis, Milwaukee; Bay City, Mich., and on the horizon in Salem, Mass.; Boise, Idaho; Cheyenne, Wyo.; Lincoln, Neb.; Indianapolis, and Annapolis, Md.During the storm, a coronal hole prompts high winds, which in turn, trigger coronal mass ejections, or CMEs. A CME projects plasma and pieces of the sun’s magnetic field into the atmosphere.
But, like a taut rubber band when it’s released, the magnetic field snaps back, and the force of that recoil creates powerful ripples known as Alfvén waves about 80,000 miles from the ground. As those waves get closer to Earth, they move faster thanks to the planet’s magnetic pull.
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