The positron mean free path. The black line represents the mean free path obtained using the slab turbulence model and gyroresonant interactions, which exhibit a cutoff at particle energies less than 2 × 10⁸ eV. The red line is the mean free path obtained using the dynamical magnetic slab turbulence, or the random sweeping slab turbulence model, which exhibit a sharp cutoff at particle energies of 10¹⁰ eV. The blue line is the mean free path obtained using isotropic magnetosonic damped plasma wave turbulence, which remains constant for particle energies from 10⁵ eV to 10¹² eV. All mean free paths are normalized with respect to the λ₁ value.