The eigenfunctions of the curl operator are obtained by separation of variables in spherical coordinates, making use of the spin-weighted spherical harmonics. It is shown that the eigenfunctions of the curl operator with vanishing divergence can be written in terms of a single scalar potential that satisfies the Helmholtz equation. It is also shown that these eigenfunctions give a complete basis for the divergenceless vector fields. © 1994 American Institute of Physics.
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Torres Del Castillo, G. F. (1994). Eigenfunctions of the curl operator in spherical coordinates. Journal of Mathematical Physics, 35(1), 499–507. https://doi.org/10.1063/1.530740