The sun... as it appeared in the wavelength of hydrogen alpha light (656.3nm) on July 29, 2012. This image in non-inverted variation can be seen here. A month later, things were much quieter. And then again, not.
Bad Astronomer Phil Plait blogged this photo on Discover.
July 29, 2012/ captured with Little Big Man, PGR Grasshopper Express 6 megapixel camera
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