Fig. 3.
Synoptic map of the photospheric magnetic field of Carrington Rotation 1708 (May 1981) observed at NSO/KP (top left), synoptic map of the calcium K line intensity of the same rotation (top right), active regions identified from the synoptic map of the magnetic field (bottom left), and active regions reconstructed from the calcium K line and sunspot observations (bottom right).
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