Red auroras were visible around the earth in the Northern Hemisphere.
We were struck by a double whammy with this CME hitting us causing Kp=8 or G4-class storms. Jujst look at the cluster of Sudden Impulses on the Notification Warning Alert Graph from NOAA below.
EDIT: This graph is dynamic not static, therefore, the graph updates automatically and is current.
cf: http://services.swpc.noaa.gov/images/no ... meline.png
http://www.spaceweather.com for March 17, 2015
CME IMPACT, SEVERE GEOMAGNETIC STORM: Arriving earlier than expected, a CME hit Earth's magnetic field on March 17th at approximately 04:30 UT. At first, the impact sparked a relatively mild G1-class (Kp=5) geomagnetic storm. Since then, however, the storm has intensified to G4-class (Kp=8), ranking it as the strongest geomagnetic storm of the current solar cycle. This storm is underway now. Before sunrise, bright auroras were sighted over several northern-tier US states including Minnesota, Wisconsin, Montana, the Dakotas and Washington. Marketa Murray sends this picture from Dalton Highway in Alaska: