All Figures

$\begin{figure} \par\includegraphics[width=5.7cm,clip]{7781fig1.eps}\end{figure}$ Figure 1: The considered domain is a cylinder inside a box with Cartesian grid of side length 2.5 L and height L. The full set of equations is solved only in the cylindrical domain.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7781fig2.eps} \end{figure}$ Figure 2: The power spectrum of the Fourier modes of $B_{\phi }$ for ${\rm Pm}=15$ and B⁰_z=0.05. Onset of the instability near t=28 where the dominating nonaxisymmetric mode m=1 starts to grow. Mode m=4 is nearly unaffected by the instability.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{7781fig3.eps}\end{figure}$ Figure 3: The m=1 pattern in the magnetic field $B_{\phi }$ for ${\rm Pm}=15$ and B⁰_z=0.05. The pattern drifts relative to the systems rotation with 4.5 times the rotation period of the cylinder. The cylinder boundary is marked by the dashed black-white line.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{7781fig4.eps}\end{figure}$ Figure 4: The external field dependence on the energy of velocity and magnetic field fluctuations at R=0.5 averaged in vertical direction for 0.35<z<0.65.
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{7781fig5.eps}\end{figure}$ Figure 5: Kinematic helicity ${\cal H}_{\rm kin}$ and current helicity ${\cal H}_{\rm curr}$ at R=0.5 and z=0.5 for ${\rm Pm}=15$ : both have different signs whereas signs of current helicity and gradient of angular velocity ${\rm d}\Omega /{\rm d}z$ are the same. The external field values are B⁰_z=0.05 for negative and B⁰_z=0.06 for positive gradient. Note the different size of ${\cal H}_{\rm kin}$ and ${\cal H}_{\rm curr}$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{7781fig6.eps}\end{figure}$ Figure 6: Kinematic helicity ${\cal H}_{\rm kin}$ as function of the external field B⁰_z with fitted parabola. Values of ${\cal H}_{\rm kin}$ are taken at R=0.5 and averaged along vertical direction for 0.35<z<0.65.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7781fig7.eps}\end{figure}$ Figure 7: Coefficient of the $\alpha$ -effect $\alpha _{zz}$ at R=0.5 for positive and negative ${\rm d}\Omega /{\rm d}z$ . Sign of $\alpha _{zz}$ is the same as ${\cal H}_{\rm curr}$ and ${\rm d}\Omega /{\rm d}z$ .
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In the text

$\begin{figure} \par\includegraphics[width=5.7cm,clip]{7781fig1.eps}\end{figure}$	Figure 1: The considered domain is a cylinder inside a box with Cartesian grid of side length 2.5 L and height L. The full set of equations is solved only in the cylindrical domain.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7781fig2.eps} \end{figure}$	Figure 2: The power spectrum of the Fourier modes of $B_{\phi }$ for ${\rm Pm}=15$ and B⁰_z=0.05. Onset of the instability near t=28 where the dominating nonaxisymmetric mode m=1 starts to grow. Mode m=4 is nearly unaffected by the instability.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{7781fig3.eps}\end{figure}$	Figure 3: The m=1 pattern in the magnetic field $B_{\phi }$ for ${\rm Pm}=15$ and B⁰_z=0.05. The pattern drifts relative to the systems rotation with 4.5 times the rotation period of the cylinder. The cylinder boundary is marked by the dashed black-white line.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{7781fig4.eps}\end{figure}$	Figure 4: The external field dependence on the energy of velocity and magnetic field fluctuations at R=0.5 averaged in vertical direction for 0.35<z<0.65.
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$\begin{figure} \par\includegraphics[width=8.6cm,clip]{7781fig6.eps}\end{figure}$	Figure 6: Kinematic helicity ${\cal H}_{\rm kin}$ as function of the external field B⁰_z with fitted parabola. Values of ${\cal H}_{\rm kin}$ are taken at R=0.5 and averaged along vertical direction for 0.35<z<0.65.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{7781fig7.eps}\end{figure}$	Figure 7: Coefficient of the $\alpha$ -effect $\alpha _{zz}$ at R=0.5 for positive and negative ${\rm d}\Omega /{\rm d}z$ . Sign of $\alpha _{zz}$ is the same as ${\cal H}_{\rm curr}$ and ${\rm d}\Omega /{\rm d}z$ .
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