AURORA WATCH: A high-speed solar wind stream hit Earth on August 6th sparking a moderate geomagnetic storm and auroras bright enough to pierce the twilight in Valkeakoski, Finland:

Photo details: Nikon D200, ISO 200, 2 second exposure.

"The 2007 autumn aurora season has finally begun," says photographer Tom Eklund.

Earth is still inside the solar wind stream, but the storm is subsiding. Bright auroras are unlikely tonight. August 9th is the next night to be alert; that's when another solar wind stream is due to arrive.

more images: from Gilles Boutin of St-Jean-Port-Joli, Quebec, Canada