All Figures

$\begin{figure} \par\includegraphics[width=6.15cm,clip]{5866fi1a.ps}\vspace*{3mm} \includegraphics[width=6.15cm,clip]{5866fi1b.ps}\end{figure}$ Figure 1: Magnetic field lines and color maps of the density contrast ( $\rho /\rho _0$ ) for two different initial configurations of magnetic field: closed field ( upper panel, those starting with MC in Table 1) and open field ( lower panel, those starting with MO in Table 1).
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In the text

$\begin{figure} \par\includegraphics[width=6.1cm,clip]{5866fi2.ps}\end{figure}$ Figure 2: Sketch of the initial configuration of the simulations with an open dipolar ambient magnetic field and an initially magnetized cloud (MOHCL and MOHCH in Table 1). The ambient dipolar magnetic field is shown in the x-z plane (see lower panel of Fig. 1). The additional magnetic field component is set inside the cloud (the long cylinder) along the y-direction.
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi3a.ps}\par\includegrap... ...,clip]{5866fi3b.ps}\par\includegraphics[width=5cm,clip]{5866fi3c.ps}\end{figure}$ Figure 3: Color maps of temperature ( left of each panel) and density contrast, $\rho /\rho _0$ ( right of each panel) at times t = 500 s, 1500 s and 3000 s, for the simulation with no magnetic field (and no thermal conduction, HC in Table 1).
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi4.ps}\end{figure}$ Figure 4: Magnetic field lines and color maps of temperature and density contrast at time t=500 s for the simulation with a strong closed magnetic field (MCLC in Table 1). The magnetic field strength is $\approx$ 2.7 G at $z\sim 1.5$ $\times$ 10¹⁰ cm along the x=0 axis (high density field lines) and no field line was drawn in the region where it becomes less than $\sim$ 1 G (z>5 $\times$ 10¹⁰ cm).
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi5a.ps}\par\includegrap... ...,clip]{5866fi5b.ps}\par\includegraphics[width=5cm,clip]{5866fi5c.ps}\end{figure}$ Figure 5: Magnetic field lines and color maps of temperature and density contrast at t=500 s, 1500 s and 3000 s for the simulation with weak closed magnetic field (MCHC in Table 1). For reference, at t=500 s the strength of the magnetic field ranges between $\approx$ 0.05 G (in the upper part of the domain where no magnetic field lines are drawn) and $\approx$ 0.7 G (just above the cloud where the lines are very dense).
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi6a.ps}\par\includegrap... ...,clip]{5866fi6b.ps}\par\includegraphics[width=5cm,clip]{5866fi6c.ps}\end{figure}$ Figure 6: Magnetic field lines and color maps of temperature and density contrast at t= 500 s, 1500 s and 3000 s for the simulation with weak open magnetic field (MOHC in Table 1). The strength of the magnetic field ranges from $\approx$ 0.03 G to $\approx$ 0.5 G.
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi7a.ps}\par\includegrap... ...,clip]{5866fi7b.ps}\par\includegraphics[width=5cm,clip]{5866fi7c.ps}\end{figure}$ Figure 7: Magnetic field lines and color maps (on the section across the cloud axis) of density contrast at t= 500 s, 1500 s and 3000 s for the simulations of a spherical cloud without magnetic field ( left of each panel, HS in Table 1) and with a weak open magnetic field ( right of each panel, MOHS in Table 1). The strength of the magnetic field ranges from $\approx$ 0.03 G to $\approx$ 0.5 G.
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In the text

$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi8a.ps}\par\includegrap... ...,clip]{5866fi8b.ps}\par\includegraphics[width=5cm,clip]{5866fi8c.ps}\end{figure}$ Figure 8: Magnetic field lines (x-z plane, left of each panel), color maps of temperature ( left) and density contrast ( right), and contours of the magnetic field y-component ( right) at time t= 500 s, 1500 s and 3000 s for the simulation with a weak open ambient field and a weak magnetic field y-component inside the cloud (MOHCL in Table 1). The contours of B_y are spaced by 0.02 G to a maximum of 0.2 G. The strength of the magnetic field on the left of the panels ranges from $\approx$ 0.03 G to $\approx$ 0.5 G.
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In the text

$\begin{figure} \par\includegraphics[width=6.15cm,clip]{5866fi1a.ps}\vspace*{3mm} \includegraphics[width=6.15cm,clip]{5866fi1b.ps}\end{figure}$	Figure 1: Magnetic field lines and color maps of the density contrast ( $\rho /\rho _0$ ) for two different initial configurations of magnetic field: closed field ( upper panel, those starting with MC in Table 1) and open field ( lower panel, those starting with MO in Table 1).
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$\begin{figure} \par\includegraphics[width=6.1cm,clip]{5866fi2.ps}\end{figure}$	Figure 2: Sketch of the initial configuration of the simulations with an open dipolar ambient magnetic field and an initially magnetized cloud (MOHCL and MOHCH in Table 1). The ambient dipolar magnetic field is shown in the x-z plane (see lower panel of Fig. 1). The additional magnetic field component is set inside the cloud (the long cylinder) along the y-direction.
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$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi3a.ps}\par\includegrap... ...,clip]{5866fi3b.ps}\par\includegraphics[width=5cm,clip]{5866fi3c.ps}\end{figure}$	Figure 3: Color maps of temperature ( left of each panel) and density contrast, $\rho /\rho _0$ ( right of each panel) at times t = 500 s, 1500 s and 3000 s, for the simulation with no magnetic field (and no thermal conduction, HC in Table 1).
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$\begin{figure} \par\includegraphics[width=5cm,clip]{5866fi6a.ps}\par\includegrap... ...,clip]{5866fi6b.ps}\par\includegraphics[width=5cm,clip]{5866fi6c.ps}\end{figure}$	Figure 6: Magnetic field lines and color maps of temperature and density contrast at t= 500 s, 1500 s and 3000 s for the simulation with weak open magnetic field (MOHC in Table 1). The strength of the magnetic field ranges from $\approx$ 0.03 G to $\approx$ 0.5 G.
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