On October 14, as most Californians were treated to a partial solar eclipse (see bottom right "visible" image showing the sun's crescent peeking out from behind the moon), researchers at the Owens Valley Radio Observatory (OVRO) took in a different view. Using OVRO's Long Wavelength Array (OVRO-LWA), they measured radio wavelengths between 20 and 88 megahertz (MHz) to create an image of the "radio eclipse." In the images and video below, the dotted lines show the moon's location and the solid lines show the visible sun's limb. Distortions in the video are caused by the sun's ionosphere. The radio waves extending beyond the sun's edge are emitted from its corona, creating a "ring of fire" effect observable even outside the path of the full annular eclipse.
A Solar "Radio Eclipse" Ring of Fire
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