S-Flare
Just below the center of the solar disk we see a sigmoid in the shape of the letter "S". 8 June 1998 15:19 UT. Solar X-ray image from the Yohkoh Soft X-Ray Telescope. Also see figure S-Flare 2, which shows this sigmoid both before and after it erupted.

This caption submitted by Piet Martens

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Page Created by Ryan McWilliams and Piet Martens