One-dimensional scale analysis of magnetic field structure along the line x = 0. (a) Magnetic field lines and current-density structure (green) in the computational domain at t = 316. The z-axis shows positions both in units of L _A (top) and in kilometers according to the scaling adopted in Section 2. (b) Profile of the B _x component of magnetic field along the line x = 0. (c) Fourier power spectrum of the B _x profile. (d) Wavelet power spectrum of the B _x profile.