Important notice about the deactivation of the STEREO ftp
Important notice about STEREO Behind
Unfurling Prominence Eruption
The STEREO (Ahead) spacecraft observed this visually stunning prominence eruption on Sept. 29, 2008 in the 304 wavelength of extreme UV light. It rose up and cascaded to the right over several hours, appearing something like a flag unfurling, as it broke apart and headed into space. The material observed is actually ionized Helium at about 60,000 degrees. Prominences are relatively cool clouds of gas suspended above the Sun and controlled by magnetic forces.
Last Revised: March 19, 2018 15:00:39 UTC
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