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We propagate relativistic test particles in the field of a steady 3D MHD simulations of the solar wind. We use the MPI-AMRVAC code for the wind simulations and integrate the relativistic guiding center equations using a new third-order accurate time integration scheme to solve the particle trajectories. Diffusion in velocity space, given a particle-turbulence mean free path λ_∥ along the magnetic field, is also included. Preliminary results for 81\: keV electrons injected at 0.139 AU heliocentric distance and mean free path λ_∥ =0.5\: AU are in a good qualitative agreement with measurements at 1 AU.
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Ahmed et al. (2024) studied this question.
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