Jan Mikael (4 Apr 2011)
"Deep Sky Auroras over the USA"

 

> 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.