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Fig. 9.

image

Top panel: space-time diagrams showing the surface density Σ(x, t) in the 2D ambipolar simulation (Ammid = 1, μeq = 10−3 and zd = 2H). The two vertical dashed lines delimit the “linear” phase, during which zonal modes, in Fourier space, grow exponentially. Bottom panel: evolution of the Bz component projected onto the kx = 4kx0 mode.

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