Comparison of collision frequency ν_e(v) function curves. The dashed black curve represents the collision frequency described by the Helander and Sigmar model, which exhibits a velocity-dependent collision frequency following a power law. On the other hand, the red curve represents the collision-frequency model proposed in Equation (11) for α = 0. In our model, ν_e converges to a finite value as velocity tends to 0, and also for large values of κ. At the same time, it decreases according to a power law, at the same rate as HS05, for sufficiently high velocities.