Date: August 17th 2006

Space Weather News for August 17, 2006 http://spaceweather com

AURORA WATCH: An explosion on the sun yesterday (Aug 16) hurled a coronal mass ejection (CME) toward Earth The approaching cloud could spark a geomagnetic storm when it arrives, probably on August 18th Sky watchers should be alert for auroras

If a storm erupts, the best displays will be at higher latitudes: e g , Alaska, Canada, and Scandinavia However, auroras could descend to lower latitudes, too, spreading across northern-tier US states from Maine to Washington and elsewhere

Sometimes during a geomagnetic storm, the sky appears to be blank--no auroras The display may be too faint to see with the unaided eye Try using your camera: a 15+ second exposure can reveal colorful auroras just below the threshold of naked-eye visibility An example of "photographic auroras" over Colorado may be found in our most recent aurora gallery:

http://www spaceweather com/aurora/gallery_01aug06 htm

Please visit http://spaceweather com for pictures of the August 16th explosion and updates about the incoming CME

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