Source - Space Weather News for August 5, 2011: http://spaceweather.com
CME IMPACT: A coronal mass ejection (CME) hit Earth's magnetic field on August 5th around 1800 UT, setting the stage for possible geomagnetic storms on August 5th and 6th. Analysts at the Goddard Space Weather Lab report that the impact may have compressed Earth's magnetosphere enough to directly expose some satellites in geosynchronous orbit to solar wind plasma. High-latitude sky watchers should be alert for auroras after nightfall. Check http://spaceweather.com for more information and updates.
DON'T MISS THE STORM: Would you like a call when geomagnetic storms are in progress? Storm alerts are available from http://spaceweathertext.com (text) and http://spaceweatherphone.com (voice).