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Yohkoh SXT Full‐Resolution Observations of Sigmoids: Structure, Formation, and Eruption

  • Authors: Richard C. Canfield, Maria D. Kazachenko, Loren W. Acton, D. H. Mackay, Ji Son, and Tanya L. Freeman

Canfield et al. 2007 The Astrophysical Journal Letters 671 L81.

  • Provider: AAS Journals

Caption: Fig. 1.

Co‐aligned overlay of an SXT PFI image of the forward‐﹩\textsf{S}﹩ sigmoid in NOAA AR 6982, 1991 December 26 18:32 UT, on magnetic field contours from the KPVT magnetogram of TBD UT, 1991 December 26, after correction for the UT difference and differential rotation. X and Y coordinates are relative to disk center. Red (black) contours indicate positive (negative) magnetic flux. Contour levels are 200, 400, and 800 G. The polarity inversion line is shown in heavier black. No single loop defines the forward‐﹩\textsf{S}﹩ shape; it is a pattern. Loops in the central region are right‐bearing.

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