Sub-proton range induced large-scale transitions in solar wind magnetic field

We investigate the role of sub-proton dynamics in inducing large-scale transitions in the solar wind magnetic eld by means of dynamical systems metrics based on instantaneous fractal dimensions. By looking at the corresponding multiscale features, we observe a break in the average attractor dimension occurring at the crossover between the inertial and the sub-proton regime. Our analysis suggests that large-scale transitions are induced by sub-proton dynamics through an inverse cascade mechanism driven by local correlations, while electron contributions (if any) are hidden by instrumental noise.