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Figure 1: Separatrix surfaces associated with bifurcated bald patches resemble the letter ``J'' in projection (reproduced from Titov & Demoulin 1999). |
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Figure 2: XRT image of the coronal sigmoid at 07:59 UT on 11 Feb. 2007. The sigmoid comprises many individual loops, in two J-shaped collectives. |
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Figure 3: Comparison of the XRT sigmoid image (contours) with the line-of-sight magnetogram from SOHO/MDI. |
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Figure 4: XRT images of the bar-shaped feature rising above the erupting sigmoid. The lower three panels represent the same times as the top three, and include a tracer line as an aid to locating the bar-shaped feature. The arrow at 07:21 UT indicates the first appearance of the post-eruption arcade. |
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