PHOTOGRAPHIC AURORAS

PHOTOGRAPHIC AURORAS: On Sunday, Nov. 8th, a minor solar wind stream buffeted Earth's magnetic field, spawning a subtle display of Northern Lights. "To the naked eye, the auroras were barely visible," says Helge Mortensen of Kvaløya, Norway. "But a 30-second exposure with my digital camera revealed a lovely green band cutting across the sky."
This kind of aurora borealis--visible to the camera but not to the eye--is called a "photographic aurora." Click on image to enlarge


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