SPATIAL STRUCTURE AND FIELD-LINE DIFFUSION IN TRANSVERSE MAGNETIC TURBULENCE

We examine magnetic surfaces and randomization of field lines with flu ctuations transverse to a uniform magnetic held. Analogy with passive scalar transport in inviscid 2D flow provides realizations of magnetic surfaces and motivates a nonperturbative statistical approach. The st ochastic wandering of magnetic field lines leads to diffusive perpendi cular transport. For two-component fluctuations, appropriate for solar wind turbulence, the diffusion coefficient is a nonadditive combinati on of slab and 2D coefficients, approaching the latter in the small am plitude limit.