All Figures

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg1.eps} \end{figure}$ Figure 1: 3D Isosurface plot of the magnetic energy density. The shaded volume surface corresponds to a magnetic energy density of $u_{\rm magn} \approx 2.5$ $\times$ $10^{-11}~{\rm erg}/{\rm cm}^3$ . The spatial extension is given in units of 10¹⁶ cm.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg2.eps}\end{figure}$ Figure 2: Magnetic field lines.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg3.eps} \end{figure}$ Figure 3: Reconnection regions, i.e. regions with appreciable value of $E_{\Vert}$ . The shaded volume surface corresponds to a value of $E_{\Vert} \approx 1.3$ $\times$ 10^-6, 4 $\times$ 10^-7, 1.3 $\times$ 10^-7, 4 $\times$ 10^-8, 1.3 $\times$ 10^-8, 4 $\times$ $10^{-9}~{\rm statvolt}/{\rm cm}$ for the six different test particle runs.
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In the text

$\begin{figure} \par\includegraphics[width=6.8cm,clip]{0065fg4a.eps}\hspace*{3mm}... ....eps}\hspace*{3mm} \includegraphics[width=6.8cm,clip]{0065fg4f.eps} \end{figure}$ Figure 4: The initial (dotted line) and final (solid line) energy spectrum of the test particle simulations for different values of the mass density ( $\overline {\rho } = 10^{n} m_{\rm p}/{\rm cm}^3$ , n=-2,-1,0,1,2,3). A least squares fit of the spectrum in a certain energy range is plotted above the spectrum and is labeled with the spectral index s.
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In the text

$\begin{figure} \par\includegraphics[width=6.8cm,clip]{0065fg5a.eps}\hspace*{3mm}... ....eps}\hspace*{3mm} \includegraphics[width=6.8cm,clip]{0065fg5f.eps} \end{figure}$ Figure 5: The initial (dotted line) and the final (solid line) synchrotron spectrum of all runs calculated as the sum of the individual synchrotron spectra of the corresponding electrons (Eq. (15)). The dashed line depicts the final synchrotron spectrum of a electron population with isotropic pitch angle distribution. The power per unit frequency $J(\nu )$ is normalized to the total rest mass energy N m c² of the set of electrons, where N is the number of all electrons.
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0065fg6a.eps}\hspace*{2mm} \includegraphics[width=6.9cm,clip]{0065fg6b.eps} \end{figure}$ Figure 6: Particle energy and synchrotron spectra of a single run with $E_\Vert = 0$ . The value for the mean density in this run is the same as in the first run in Figs. 4 and 5 ( $\overline {\rho } = 10^{-2} m_{\rm p}/{\rm cm}^3$ ). Due to the lower mean electric field energy the achieved energy levels are lower.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg7.eps} \end{figure}$ Figure 7: The initial (dotted line) and final (solid line) energy spectrum of a test particle run with larger box size of $l = 10^{17}~{\rm cm}$ . The density for this run was chosen to be $\hat{\rho} = 10^{-2}~m_{\rm p}/{\rm cm}^3$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg1.eps} \end{figure}$	Figure 1: 3D Isosurface plot of the magnetic energy density. The shaded volume surface corresponds to a magnetic energy density of $u_{\rm magn} \approx 2.5$ $\times$ $10^{-11}~{\rm erg}/{\rm cm}^3$ . The spatial extension is given in units of 10¹⁶ cm.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg2.eps}\end{figure}$	Figure 2: Magnetic field lines.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg3.eps} \end{figure}$	Figure 3: Reconnection regions, i.e. regions with appreciable value of $E_{\Vert}$ . The shaded volume surface corresponds to a value of $E_{\Vert} \approx 1.3$ $\times$ 10^-6, 4 $\times$ 10^-7, 1.3 $\times$ 10^-7, 4 $\times$ 10^-8, 1.3 $\times$ 10^-8, 4 $\times$ $10^{-9}~{\rm statvolt}/{\rm cm}$ for the six different test particle runs.
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$\begin{figure} \par\includegraphics[width=6.8cm,clip]{0065fg4a.eps}\hspace{3mm}... ....eps}\hspace{3mm} \includegraphics[width=6.8cm,clip]{0065fg4f.eps} \end{figure}$	Figure 4: The initial (dotted line) and final (solid line) energy spectrum of the test particle simulations for different values of the mass density ( $\overline {\rho } = 10^{n} m_{\rm p}/{\rm cm}^3$ , n=-2,-1,0,1,2,3). A least squares fit of the spectrum in a certain energy range is plotted above the spectrum and is labeled with the spectral index s.
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$\begin{figure} \par\includegraphics[width=6.9cm,clip]{0065fg6a.eps}\hspace*{2mm} \includegraphics[width=6.9cm,clip]{0065fg6b.eps} \end{figure}$	Figure 6: Particle energy and synchrotron spectra of a single run with $E_\Vert = 0$ . The value for the mean density in this run is the same as in the first run in Figs. 4 and 5 ( $\overline {\rho } = 10^{-2} m_{\rm p}/{\rm cm}^3$ ). Due to the lower mean electric field energy the achieved energy levels are lower.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{0065fg7.eps} \end{figure}$	Figure 7: The initial (dotted line) and final (solid line) energy spectrum of a test particle run with larger box size of $l = 10^{17}~{\rm cm}$ . The density for this run was chosen to be $\hat{\rho} = 10^{-2}~m_{\rm p}/{\rm cm}^3$ .
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