Fig. 1.

Sketch of the initial configuration. The simulation domain (filled with blue color) is contained in the XOZ plane, where x varies between −L0 and L0 and z varies between −4L0 and 4L0. The magnetic field, B (red lines), is contained in the XOY plane (filled with gray color). At the height z = 0, the magnetic field only has the component, By, and it is slowly rotated above and below z = 0 by an angle which depends on height, keeping its modulus constant. The value of the angle is anti-symmetric with respect to z = 0. The maximum angle obtained at the top and the bottom of the atmosphere is indicated by θ0. When the field is perpendicular, the direction of B is along the y-axis for all the heights, θ0 = 0°. For the sheared magnetic field configurations θ0 = 1°. The gravity, g, points in the negative z direction and is indicated by a green line. The direction of the perturbation, k, is shown by a blue line.
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