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Fig. 19.

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Fourier amplitudes of the magnetic energy perturbation for the MHD simulations and the simulations with ambipolar effect included as a function of the horizontal mode number for the cases: P (left) and P-f (right). The amplitudes are calculated by a FFT transform in the x-direction for a snapshot taken at time t = 217.8 s and averaged in height between 0.8 Mm and 1.7 Mm.

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