Jan Mikael (4 Apr 2011)
"Deep Sky Auroras over the USA"
> Space Weather News for April 3, 2011
> 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.