http://www.spaceweather.com

AURORA ALERT: An interplanetary shock wave spawned by Monday's powerful solar explosion swept past our planet at approximately 2100 UT (2:00 p.m. PDT) on Tuesday, Sept. 25th. The solar wind velocity soared from 400 km/s to more than 800 km/s in a matter of minutes as the shock wave sped by. Earth is still inside the resulting high-speed solar stream and auroras are possible tonight even at low latitudes where such displays rarely happen. Sky watchers are advised to look for Northern Lights after local sunset. Local midnight is usually the best time for aurora spotting but if a powerful geomagnetic storm develops bright auroras might be visible at any time of the night.