Pick of The Week
 
 

Double Eruptive Prominences (March 21, 2003)

Hi-resolution image (TIF,4.0M)

Two large solar prominences in extreme ultraviolet light (ionized helium at 304) roughly the same size but quite different in structure appeared on the Sun on 18 March 2003. The observation of two large prominences in one image makes this one of the most spectacular images that SOHO has captured.

Prominences are huge clouds of relatively cool, dense plasma suspended in the Sun's hot, tenuous corona. Magnetic fields built up enormous forces that propelled particles out beyond the Sun's surface. The one on the right and possibly both were associated with a flare and a coronal mass ejection that blasted away from the Sun at about the time of this image. The twisting nature of the one on the right is of particular interest to some solar physicists who believe that eruptive events like this are the Sun's way of getting rid of magnetic fields that are twisted up too tightly, like the rubber bands that run model airplanes. For a sense of scale, the prominences extend about 20 Earths out from the Sun. They both had disappeared by the time the next image was taken 6 hours later.

Previous Picks of the Week

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.

If your institution would also like to receive the same Weekly Pick from us for display (usually in Photoshop or QuickTime format), please send your inquiry to steele.hill@gsfc.nasa.gov.

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