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Fig. 4

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SOHO/MDI (top row) and Hinode/XRT (bottom row) observations of AR 10977 showing the inversing crossing of sigmoidal threads on 7 December at 01:39 and 03:29 UT. In the second panel the MDI data were taken at 7 December 03:12 UT and rotated to the time of the XRT image at 03:29 UT. The MDI data are displayed between  ± 100 Gauss. The little bipole seen on 7 December after 03 UT at (x,y) = (135, −130) and the corresponding set of compact X-ray loops (Figs. 2 and 3) were used to coalign the images. An accuracy of approx. 1.5″ is achieved by using this feature as well as other small scale features.

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