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This is an image of the sun in H-alpha -- i.e., an image taken through a filter centered on a specific spectral line of Hydrogen, with a wavelength of 6563 A. A high resolution JPG image can be found here. Active regions in this image show up as brighter than their surroundings. The dark, string-like features are filaments.

The image was digitized from a photograph provided by the Space Environment Laboratory, National Aeronautic and Oceanic Administration (Boulder, CO). For more information on this image, see the HAO slideset "The Sun: a Pictorial Introduction", by P. Charbonneau and O.R. White.

 
 

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