All Figures

$\begin{figure} \par\mbox{\subfigure[]{\includegraphics[width=3.78cm,clip]{7455fi... ... \subfigure[]{\includegraphics[width=3.78cm,clip]{7455fig1c.eps} }} \end{figure}$ Figure 1: Contour plot illustrating $\vert \vec{B} \vert$ on a) the lower and b) the upper boundaries of the domain. Superimposed are vectors of the imposed spinning driving velocity in the same planes. The flux sources are labelled A (left-most source) and B (right-most source) on the lower boundary and a (lower source) and b (upper source) on the upper boundary. As shown for the z=0.5 plane in c), there are initially four regions of differing magnetic flux connectivity in the domain, with flux connecting sources A and a labelled Aa, and similarly for Ab, Ba and Bb.
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In the text

$\begin{figure} \par\mbox{\subfigure[]{\includegraphics[width=6cm,clip]{7455fig2a... ...\subfigure[]{\includegraphics[width=6cm,clip]{7455fig2dCMJN.eps} }} \end{figure}$ Figure 2: Selected field lines traced from the two sources on the lower boundary, at spin angles a) $\theta =0$ b) $\theta =0.79$ c) $\theta =1.87$ and d) $\theta =2.64$ . Those traced from source A are coloured red and those from source B coloured green. The field lines are seen to become increasingly twisted with spin angle and, in addition, it is seen that the initially equal distribution of flux from a single source on the lower boundary between both sources on the upper boundary becomes unequal with increasing spin-angle. Over-plotted are isosurfaces of current; a twisted current sheet is seen to form in the centre of the domain.
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In the text

$\begin{figure} \par\includegraphics[width=2.8cm,clip]{7455fig3aCMJN.eps}\include... ...5fig3eCMJN.eps}\includegraphics[width=2.8cm,clip]{7455fig3fCMJN.eps}\end{figure}$ Figure 3: Magnetic flux connectivity of source A with spin angle. Flux with connectivity Aa is shown in light blue, flux with connectivity Ab is shown in dark blue and flux which leaves the box in red. Due to the symmetry of the system the flux connectivity of source B follows the same pattern, with connectivity type Ba becoming dominant.
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In the text

$\begin{figure} \par\includegraphics[width=9cm,clip]{7455fig4.eps}\end{figure}$ Figure 4: Change in magnetic flux connectivity with spin angle of source A (B) on the lower boundary. The solid line shows the percentage of flux with connection Ab (Ba), the dashed line the percentage of flux with connection Aa (Bb) and the dot-dashed line the percentage of flux from source A (B) that leaves the box.
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In the text

$\begin{figure} \par\includegraphics[width=4.7cm,clip]{7455fig5aCMJN.eps}\hspace*... ...space*{1.05cm} \includegraphics[width=4.7cm,clip]{7455fig5fCMJN.eps}\end{figure}$ Figure 5: The figure shows a sequence of images at increasing spin-angles in which the magnetic flux passing through the central plane, z=0.5, is coloured according to its magnetic connectivity. Flux with connectivity Aa is indicated in light blue, Ab in dark blue, Bb in red and Ba in yellow. Flux not associated with any of these connectivity types is not coloured. Over-plotted are contours of current density in the same plane.
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In the text

$\begin{figure} \par\includegraphics[width=4.2cm,clip]{7455fig6aCMJN.eps}\include... ...5fig6gCMJN.eps}\includegraphics[width=4.2cm,clip]{7455fig6hCMJN.eps}\end{figure}$ Figure 6: Sequence of images showing contours of current in the central plane z=0.5 at increasing spin angles. Four wings of current are seen to extend from a strong current sheet in the centre of the domain. At later spin-angles Y-shaped cusps are seen to develop at the ends of the current sheet, seen here for example at $\theta =1.45$ . (The white line outlines a cross-section described later in the text.)
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In the text

$\begin{figure} \par\includegraphics[width=3.5cm,clip]{7455fig7a.eps}\hspace*{0.8... ...s}\hspace*{1.15cm} \includegraphics[width=3.2cm,clip]{7455fig7f.eps}\end{figure}$ Figure 7: Tangential (solid lines) and normal (dashed lines) components of the magnetic field, velocity and current (upper plots) together with the density, total pressure and $\vert \nabla \times \vec{v} \vert$ (lower plots) along the line y=1.3-xat spin-angle $\theta =1.45$ for the central plane z=0.5. The vertical lines denote the location of the current "wings'' along that line (as seen in Fig. 6). The presence of a normal field component across the structures, absence of a plasma flow across them together with the continuous pressure variation but jumps in density are evidence for a contact discontinuity at these locations.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{7455fig8.eps}\end{figure}$ Figure 8: Strength of the z-component of the electric current in the central plane z=0.5 along the line y=-x which passes along the central separator current sheet. A spike of reversed current is seen at both ends of the sheet.
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In the text

$\begin{figure} \par\includegraphics[width=6.1cm,clip]{7455fig9a.eps}\vspace*{3.5... ...ps}\vspace*{3.5mm} \includegraphics[width=6.1cm,clip]{7455fig9d.eps}\end{figure}$ Figure 9: Plasma flows in the central plane, z=0.5 for a sequence of increasing spin-angles showing the key stages in the velocity evolution. A stagnation flow forms with strong outflow jets along the central current sheet.
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In the text

$\begin{figure} \par\subfigure[]{\hspace*{-0.5cm}\includegraphics[width=7.05cm,cl... ... \subfigure[]{\includegraphics[width=6.8cm,clip]{7455fg10b.eps} } \end{figure}$ Figure 10: a) Four illustrative field-lines being carried into the central current sheet before reconnection (red, light blue) and away from the sheet having reconnected (dark blue, yellow), together with contours of current in the central plane. The post-reconnection field lines are seen to have less shear than the pre-reconnection lines. b) An X-type field structure is present only in vertical cross-sections, while in horizontal sections, such as that illustrated here, the field has an O-type topology.
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In the text

$\begin{figure} \par\includegraphics[width=5.85cm,clip]{7455fg11aCMJN.eps}\hspace*{3mm} \includegraphics[width=5.85cm,clip]{7455fg11bCMJN.eps}\end{figure}$ Figure 11: Flux connectivities in a central square within the mid-plane encompassing the non-ideal region, for ( left) $\theta =1.19$ and ( right) $\theta =1.58$ . The colour scheme is the same as that for Fig. 5. A complex topology is present in the early stages of the experiment, becoming much simpler as the spin-angle increases.
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In the text

$\begin{figure} \par\includegraphics[width=5.15cm,clip]{7455fg12a.eps}\hspace*{9mm} \includegraphics[width=5.95cm,clip]{7455fg12b.eps}\end{figure}$ Figure 12: ( left) The change in maximum current (within the central square of side 0.4 in the z=0.5 plane) with spin angle. The thick solid line represents the case of $\pi /2$ misaligned flux sources and the thick dashed line the case of aligned flux sources. The vertical lines mark the spin angle at which reconnection begins in both cases. ( right) Flux connectivities for the misaligned (solid line) and aligned (dashed line) cases, as described in the main body of the text.
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In the text

$\begin{figure} \par\includegraphics[width=2.8cm,clip]{7455fig3aCMJN.eps}\include... ...5fig3eCMJN.eps}\includegraphics[width=2.8cm,clip]{7455fig3fCMJN.eps}\end{figure}$	Figure 3: Magnetic flux connectivity of source A with spin angle. Flux with connectivity Aa is shown in light blue, flux with connectivity Ab is shown in dark blue and flux which leaves the box in red. Due to the symmetry of the system the flux connectivity of source B follows the same pattern, with connectivity type Ba becoming dominant.
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$\begin{figure} \par\includegraphics[width=9cm,clip]{7455fig4.eps}\end{figure}$	Figure 4: Change in magnetic flux connectivity with spin angle of source A (B) on the lower boundary. The solid line shows the percentage of flux with connection Ab (Ba), the dashed line the percentage of flux with connection Aa (Bb) and the dot-dashed line the percentage of flux from source A (B) that leaves the box.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{7455fig8.eps}\end{figure}$	Figure 8: Strength of the z-component of the electric current in the central plane z=0.5 along the line y=-x which passes along the central separator current sheet. A spike of reversed current is seen at both ends of the sheet.
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$\begin{figure} \par\includegraphics[width=6.1cm,clip]{7455fig9a.eps}\vspace{3.5... ...ps}\vspace{3.5mm} \includegraphics[width=6.1cm,clip]{7455fig9d.eps}\end{figure}$	Figure 9: Plasma flows in the central plane, z=0.5 for a sequence of increasing spin-angles showing the key stages in the velocity evolution. A stagnation flow forms with strong outflow jets along the central current sheet.
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$\begin{figure} \par\includegraphics[width=5.85cm,clip]{7455fg11aCMJN.eps}\hspace*{3mm} \includegraphics[width=5.85cm,clip]{7455fg11bCMJN.eps}\end{figure}$	Figure 11: Flux connectivities in a central square within the mid-plane encompassing the non-ideal region, for ( left) $\theta =1.19$ and ( right) $\theta =1.58$ . The colour scheme is the same as that for Fig. 5. A complex topology is present in the early stages of the experiment, becoming much simpler as the spin-angle increases.
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