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Published online by Cambridge University Press: 12 April 2016
The author’s 1964 article in Nature on the sun’s rotation is rediscussed in the light of new data. This article suggested that the sun might be oblate because of a gravitational quadrupole moment induced by a core rotating with a period < 2 days. Angular momentum lost from the core by molecular diffusion was assumed to be transferred to the solar wind which kept the sun’s surface rotating slowly. The estimated solar wind torque was found to be in good agreement with the torque calculated from a solution of the diffusion equation.
This research was supported in part by the National Science Foundation and the Office of Naval Research of the U.S. Navy.