Abstract
In order to provide a smooth transition to a smaller aperture for the Mount Wilson daily magnetograms, a 2-step change was made, with two daily observations made using two different apertures covering an interval of several months. A comparison of these observations has made possible a check on the zero-level and calibration errors of the Mount Wilson magnetograph in recent years, and it has shown that an interval of low measured total magnetic flux resulted at least in part from an increase in the mixing of magnetic elements of the two polarities on a scale comparable with the aperture size.
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Howard, R. Studies of solar magnetic fields. Sol Phys 47, 575–580 (1976). https://doi.org/10.1007/BF00154766
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DOI: https://doi.org/10.1007/BF00154766