Snapshots of the normalized Alfvén speed ﹩{v}_{{\rm{A}}}/{v}_{A0}﹩ on the xy plane (z = 0, upper panels) and normalized amplitude of Alfvén wave B_y/B_z on the xz plane (y = 0, lower panels). From left to right, the snapshots shown are t = 0 (initial condition), t = 12/τ₀ (saturation phase), t = 18τ₀ (early nonlinear phase), and t = 24τ₀ (fully nonlinear phase). An animation of this figure runs from t = 0 to t = 30 and the duration is 15 s.

(An animation of this figure is available.)

The video/animation of this figure is available in the online journal.