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tokens: Matthaeus et al. 2007 ), but which for the purposes of comparison has the benefit of having been used in previous electron modulation studies, as well as providing results not vastly different from those derived using a more realistic spectral form (Engelbrecht Burger 2013a ). Expressions for derived using different energy-containing range spectral indices can be found in Shalchi et al. ( 2010 ) as well as Engelbrecht Burger ( 2015 ). The results of this calculation are shown in the right panel of Figure 2 . The solutions where PUI effects have been neglected are considerably smaller than the corresponding values, with a less steep rigidity dependence, in contrast with what is usually assumed in cosmic-ray modulation studies. A decrease in dynamical effects leads to larger perpendicular MFPs due to their dependence on . When , the PUI-affected solutions are very small relative to when PUI effects are ignored, as expected, but now assume values larger than the corresponding parallel MFPs. This is a consequence of the dependence in Equation ( 10 ). Choosing leads to perpendicular MFPs smaller than the corresponding at 50 and 100 au, and larger at 10 au. Figure 1. Wavelike energies (top panel) and parallel correlation scales (middle panel) yielded by the Oughton et al. ( 2011 ) TTM model both with (blue lines) and without (red lines) PUI driving. Bottom panel shows (Equation ( 9 )) at 1 MeV as function of μ at 10 au using inputs from the abovementioned TTM. Figure 2. Parallel mean free paths at various radial distances taking into account PUI effects (red lines) and neglecting them (blue lines; Equation ( 6 )), as a function of rigidity for full dynamical effects (; top panels) and reduced dynamical effects (; bottom panels). To study the effects of PUI-driven waves on the electron drift coefficients, an expression for the turbulence-reduced drift coefficient proposed by Engelbrecht et al. ( 2017 ) is employed, where the lengthscale corresponding to the drift coefficient is given bywhere denotes the total transverse variance. This expression reduces to the weak scattering, full drift lengthscale in the absence of turbulence. Figure 3 shows this drift lengthscale as function of rigidity for and at various radial distances, including the PUI-affected perpendicular MFPs from Figure 2 for the purposes of comparison. Note that this figure is plotted on a different scale to that of Figure 2 , for the purpose of clarity. Solutions computed without PUI effects (blue lines) decrease sharply from the weak scattering values (black lines) at the lowest rigidities, due to the larger values of at these rigidities, and remain well below the calculated assuming no PUI effects for both values of α . When PUI effects are included, though, the drift lengthscale at 10 au also drops below the weak scattering value for both values of α , and remains below the corresponding . At 50 and 100 au, however, the PUI-influenced drift coefficient becomes very similar to the