STEREO - Solar Terrestrial Relations Observatory
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Important notice about STEREO Behind

24/7 of the Sun - April 22-28, 2007


Here is one way to demonstrate concretely and dramatically that STEREO is watching the Sun seven days a week, 24 hours a day. We have put together an entire week's (April 22- 28, 2007) worth of frames into a movie of the Sun in extreme ultraviolet light (304 Angstroms). The frames do not show off any major solar events. The devil, as they say, is in the details and what lovely details are revealed. The Sun's edge can be seen busily erupting with little spicules (vertical spikes), sliding and curling plasma, and small prominences loops. These kinds of finely scaled events were much harder to pick out with the older Solar and Heliospheric Observatory (SOHO) mission. Why? Because SOHO's frames are only 60% as big and, thus, provide less resolution. And as for smooth motion, STEREO takes images in several wavelengths every 10 minutes, something that SOHO usually did in another wavelength, rarely in this one. So this is a visual treat that we can expect to see more and more.

Credit: NASA/STEREO/Naval Research Laboratory

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