According to http://spaceweather.com/
AURORA WATCH: A solar wind stream is heading for Earth, and so is a coronal mass ejection (CME). Together, they add up to a geomagnetic storm alert for March 17th and 18th. 2010 The impact of the solar wind plus CME will brighten Arctic skies already alive with Northern Lights:

NASA Warning

Discovery Portrayal of what can happen!