Fig. 6

MDI magnetograms of AR 8164 showing the photospheric evolution of its main polarities. The shape and evolution of the magnetic tongues indicates that the magnetic helicity of AR 8164 is negative. The magnetograms have been rotated to the central meridian position of the AR (positive/negative magnetic field polarities are indicated in white/black). The size of the field of view is the same in all panels.
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