  By applying recent results for the slab correlation time scale onto cosmic
ray scattering theory, we compute cosmic ray parallel mean free paths within
the quasilinear limit. By employing these results onto charged particle
transport in the solar system, we demonstrate that much larger parallel mean
free paths can be obtained in comparison to previous results. A comparison with
solar wind observations is also presented to show that the new theoretical
results are much closer to the observations than the previous results.
