Abstract
It is a standard assumption that parallel scattering suppresses perpendicular diffusion to a subdiffusive level when the turbulence lacks transverse structure. In several previous papers, it has been demonstrated that a running or time-dependent diffusion coefficient decreases with increasing time. In most studies, it was assumed that this subdiffusive behaviour is directly related to the slab structure of turbulence. By applying reliable analytical calculations in combination with realistic forms of the wavespectrum of interplanetary turbulence, it is demonstrated in this paper that the long-time behaviour of running diffusion coefficients depends on the wavespectrum in the energy range. If the energy range spectral index exceeds unity, diffusion is recovered. This recovery of diffusion obtained within the magnetostatic slab model is an unexpected result.
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