Temporal evolution of the parallel and perpendicular components of the ion temperatures for initially nondrifting distributions. Panel a) shows a nonexpanding case. Panel b) illustrates the expansion with ε = 10^-4 Ω_p. The top rows describe the α particles, whereas the bottom rows depict the protons. The solid red lines denote the perpendicular and the dashed-dotted blue lines stand for the parallel temperature components. The solid green lines denote the perpendicular temperature decrease as predicted by the CGL model.