All Figures

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{2272fig1.eps} \end{figure}$ Figure 1: A contour plot of the vertical component B_0z of the equilibrium magnetic field, along with the trajectories of 70 magnetic lines. The stating point of each magnetic line is randomly chosen inside the periodicity domain.
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In the text

$\begin{figure} \par\includegraphics[width=9.4cm,clip]{2272fig2.eps}\par\vspace*{2mm} \includegraphics[width=8.9cm,clip]{2272fig3.eps} \end{figure}$ Figure 2: A regular ( upper panel) and a singular ( lower panel) flux tube.
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In the text

$\begin{figure} \par\includegraphics[width=6cm,clip]{2272fig4.eps}\par\vspace*{2m... ...ar\vspace*{2mm} \includegraphics[width=6.5cm,clip]{2272fig6.eps} \end{figure}$ Figure 3: The trajectory of a packet ( upper panel); the wavevector k ( middle panel) and the energy e ( lower panel) of the packet, as functions of time t.
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In the text

$\begin{figure} \par\includegraphics[width=6.5cm,clip]{2272fig7.eps} \end{figure}$ Figure 4: The dissipation time $t_{\rm d}$ of the same packet as in Figs. 6, as a function of the Reynolds number S (dots). The full line indicates a scale law $t_{\rm d} \propto \log S$ .
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In the text

$\begin{figure} \par\includegraphics[width=6.6cm,clip]{2272fig8.eps}\par\vspace*{4mm} \includegraphics[width=6.6cm,clip]{2272fig9.eps} \end{figure}$ Figure 5: The reflection coefficient $r_{\rm A}$ (thick line), the transmission coefficients $t_{\rm A}$ (dashed line) and $t_{\rm M}$ (thin line), as functions of the angle $\phi$ , calculated for $k_{\vert\vert}^{\rm IA}/ k_{1\perp }^{\rm IA}=0.1$ and $k_{\vert\vert}^{\rm IA}/ k_{2\perp }^{\rm IA}=0.1$ , and for r=0.01 ( upper panel) and r=0.032 ( lower panel).
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{2272fi10.eps}\par\vspace*{2mm} \includegraphics[width=8cm,clip]{2272fi11.eps} \end{figure}$ Figure 6: The energy ratios $E_{\rm diss}/E_0$ (full line), $E_{\rm t}^{\rm A}/E_0$ (dashed line), $E_{\rm t}^{\rm M}/E_0$ (dotted line), and $E_{\rm r}^{\rm M}/E_0$ (dash-dotted line) are shown as functions of the Reynolds number S, for $\alpha = 7\pi$ (no symbols) and for $\alpha =0$ (black dots). The upper and lower panels refer to the case r=0.01 and r=0.032, respectively.
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In the text

$\begin{figure} \par\includegraphics[width=6.1cm,clip]{2272fi12.eps} \end{figure}$ Figure A.1: The $(\xi , \eta , \zeta )$ reference frame is represented, along with the wavevector $\vec{k}$ and the magnetic field $\vec{B}_0$ , whose direction is given by the unit vectors $\vec{e}_k$ , $\vec{e}_B$ , respectively. The unit vector $\vec{e}_{\rm A}$ gives the polarizarion of Alfvén waves, while the unit vectors $\vec{e}_1$ and $\vec{e}_2$ are in the $\xi \eta$ plane, perpendicular to $\vec{k}$ and to $\vec{B}_0$ , respectively. The dashed line is parallel to $\vec{e}_2$ .

In the text

$\begin{figure} \par\includegraphics[width=6.5cm,clip]{2272fi13.eps} \end{figure}$ Figure A.2: The (X, Y, Z ) reference frame is represented. The XY-plane corresponds to the base of the corona; the background magnetic field is in the YZ plane, at an angle $\phi$ with the horizontal direction.

In the text