Three-fer (July 1, 2011)
Hi-res TIF image (1.1M)
This single STEREO image (June 27, 2011) in extreme UV light from the Ahead spacecraft contains three major, magnetic solar features, all clearly identifiable: a coronal hole, an active region, and a long filament. The coronal hole is a dark area, where there is less material in the wavelength being imaged and from which streams high-speed solar wind. The large, central active region (and there are a few others) is actually a group of active regions, often the source of solar storms. These areas appear brighter in extreme UV light. Lastly, a long, meandering filament stretches across more than half the width of the Sun, over 500,000 miles. These are clouds of cooler gases that hover above the Sun?s surface, suspended by magnetic forces. While all three features are fairly common, they do not usually appear to stand out so well at the same time.
SOHO began its Weekly Pick some time after sending a weekly image or video clip to the American Museum of Natural History (Rose Center) in New York City. There, the SOHO Weekly Pick is displayed with some annotations on a large plasma display.
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