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Sheeley 1976
Sheeley, N.R. (1976). Polar faculae during the interval 1906–1975. Journal of Geophysical Research 81: doi: 10.1029/JA081i019p03462. issn: 0148-0227.

In a previous study (Sheeley, 1964, 1966) the numbers of faculae at the poles of the sun were counted and used to estimate the strengths of the polar magnetic fields during the period 1906--1964. The present paper extends this study to include the recent period 1964--1975. The new observations show the following: (1) The polar fields are stronger now than they have been for a decade. At the south pole, most of this increase in strength occurred in 1973 during the Skylab mission. At the north pole the change occurred gradually during 1972 and 1973. (2) Except for a relatively brief interval during 1959 the south polar field has been weaker during the last magnetic cycle than it has been during any cycle since this uniform set of observations began at Mount Wilson in 1906.

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Journal of Geophysical Research
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