Similar to Figure 2, except that the CRs initially have cone distributions. Left panels: The spatial profiles of the magnetic field components at ﹩t\approx 7{\gamma }_{\,\rm{fast}\,}^{-1}﹩. The x-axes are normalized to λ_fast = 2π/k_fast ≈ 50d_i. In the shaded zoomed-in part, the dominant wavelengths ∼λ_fast are prominent. Right panels: Time evolution of helicities Δϕ(k).