Source - Space Weather News for August 4, 2011: http://spaceweather.com
SOLAR ACTIVITY: For the third day in a row, sunspot 1261 has unleashed a significant M-class solar flare. The latest blast at 0357 UT on August 4th registered M9.3 on the Richter Scale of Flares, almost crossing the threshold into X-territory (X-flares are the most powerful kind). Also, at least two coronal mass ejections are en route to Earth, and they could provoke mild to moderate geomagnetic storms when they arrive on August 4th through 6th. High-latitude sky watchers should be alert for auroras. Check http://spaceweather.com for details and updates.
DON'T MISS THE STORM: Would you like a call when geomagnetic storms are in progress? Space weather alerts are available from http://spaceweathertext.com (text) and http://spaceweatherphone.com (voice).