Ion–neutral drift velocities as a function of pressure and latitude at the evening terminator (a): ϕ = 90^◦) and morning terminator (b): ϕ = −90^◦) for two different approaches. Solid lines show $\left|\Delta {\underset{\_}{v}}_i\right|$ from the present formulation (Eq. 31) and dashed lines follow Savel et al. (2024, see our Eq. C.1). Colors denote the latitude. The drift velocities are approximated using neutral wind fields from a simulation without magnetic drag and a dipolar magnetic field (Eq. 28) with B₀ = 5 G in both approaches. The results demonstrate the latitudinal dependence introduced by magnetic field geometry and the effect of anisotropic drag on the ion-neutral drift velocity.