Abstract
Two methods of observing the neutral line of the large-scale photospheric magnetic field are compared: (1) neutral line positions inferred from Hα photographs (McIntosh, 1972a, 1975; McIntosh and Nolte, 1975) and (2) observations of the photospheric magnetic field made with low spatial resolution (3′) and high sensitivity using the Stanford magnetograph. The comparison is found to be very favorable.
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Duvall, T.L., Wilcox, J.M., Svalgaard, L. et al. Comparison of Hα synoptic charts with the large-scale solar magnetic field as observed at Stanford. Sol Phys 55, 63–68 (1977). https://doi.org/10.1007/BF00150874
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DOI: https://doi.org/10.1007/BF00150874