NASA image acquired May 1, 2010.
As an active region rotated into view, it blew out three relatively little eruptions over about two days (Apr. 30 – May 2) as STEREO (Ahead) observed in extreme UV light. The first one was the largest and exhibited a pronounced twisting motion (shown in the still from May 1, 2010). The plasma, not far above the Sun’s surface in these images, is ionized Helium heated to about 60,000 degrees. Note, too, the movement of plasma flowing along magnetic field lines that extend out beyond and loop back into the Sun’s surface. Such activity occurs every day and is part of the dynamism of the changing Sun.
To learn more about STEREO go to: soho.nascom.nasa.gov/home.html
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