Deep Sky Auroras over the USA

Source - Space Weather News for April 3, 2011: http://spaceweather.com

DEEP SKY AURORAS: A solar wind stream hit Earth's magnetic field over the weekend, sending a wave of "deep sky auroras" over northern-tier US states. The lights were pale-white or even invisible to the naked eye, but digital cameras revealed spectacular colors and luminous shapes above Wisconsin, Michigan, Minnesota, and elsewhere. Visit http://spaceweather.com for images and more information about this phenomenon.

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