Characteristics of the decaying simulation of solar-wind turbulence (Sim 1). (a) Current density normalized to its RMS J_rms (color map) and magnetic field lines (orange) in the full 3D plasma box. (b) Box-averaged square current density J² as a function of time. The vertical dashed line marks the time of the snapshot ($t\simeq 650{\text{Ω}}_{\text{ci}}^{-1}$) used to initialize the solar-wind turbulence in Sim 2.1. (c) Power spectrum of magnetic and velocity field for parallel and perpendicular wavevectors.