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tokens: O.P. sincerely thanks Dr. A. Retinò and Prof. W. H. Matthaeus for the fruitful discussions. O.P. and S.S. are partly supported by the International Space Science Institute (ISSI) in the framework of the International Team 405 entitled “Current Sheets, Turbulence, Structures and Particle Acceleration in the Heliosphere.” D.P. was partially supported by STFC grant ST/N000692/1. Numerical simulations discussed here have been performed on the Marconi cluster at CINECA (Italy), within the projects IsC53_RoC-SWT and IsC63_RoC-SWTB, and on the Newton cluster at the University of Calabria (Italy). This project (F.V., S.S.) has received funding from the European Unions Horizon 2020 research and innovation program under grant agreement No. 776262 (AIDA, www.aida-space.eu ).