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AbstractDifferent drift velocities of electrons and ions in response to viscous forces exerted by neutral atoms generate current densityjand magnetic fieldB, whereBis proportional to vorticityωof the fluid. Magnetic vortex tubes (MVTs) form arrays on a hierarchy of scales. MVTs are basic to the magnetism of all astrophysical systems, conferring a structure of aligned filaments. In the Sun a torsional oscillation generates oscillatory vorticity, and hence an oscillatory magnetic field. The samedoi:10.1017/s0252921100020625 fatcat:54cuxkpcfzcizhrabtfdi6hvq4