All Figures

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig1.eps} \end{figure}$ Figure 1: Alfvén speed vs. distance from tube axis for straight tube. For values of $\omega /k$ on the dashed line, no wave solutions exist. For values of $\omega /k$ on the dotted line, wave solutions exist everywhere. For values of $\omega /k$ on the dot dashed line, wave solutions only exist in the tube.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig2.eps} \end{figure}$ Figure 2: Alfvén speed vs. distance from tube axis for curved tube. The horizontal lines are plotted at the same points as in Fig. 1.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig3.eps} \end{figure}$ Figure 3: Contours of $V_{\rm perp}$ for a driver period of 0.48 at the termination of driving (t=144). The driver has excited a dominant eigenmode with a period of 0.51. Note that the pattern is highly asymmetric due to the footpoint driver. The mode number for this eigenmode is n=16.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2527fig4.eps} \end{figure}$ Figure 4: Contours of $V_{\rm perp}$ for the longest wavelength simulated in this paper, with a driver period of 1.32. This contour is after the driving has stopped and the system is freely decaying. This figure was generated at t=168. The mode number for this eigenmode is n=5, and the driver has excited a dominant eigenmode with a period of 1.54.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig5.eps} \end{figure}$ Figure 5: Contours of $\vert V_{\rm perp}\vert$ for the same simulation and time as Fig. 4.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=8.6cm,clip]{2527fig6.eps}\end{figure}$ Figure 6: The decay of $\psi$ vs. time. The upper line shows shorter periods, and has a slower decay. The upper line is from the simulation shown in Fig. 3, and the lower line from the simulation shown in Fig. 4. Note that the system shows three distinct phases, the stable region with the driver on, the rapid initial decay when the driver is switched off (t=144) and finally the stable decay of the normal mode of the tube. The data is averaged using a moving average over one period of the driver.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig7.eps} \end{figure}$ Figure 7: Contours of $\vec{V}_{\rm perp}$ at the end of the simulation shown in Fig. 3. Note that the pattern is now symmetric.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{2527fig8.eps} \end{figure}$ Figure 8: Decay constant vs. observed eigenmode period in dimensionless units for domain with velocity damping boundaries and a density contrast ratio of 10. This is one of a family of similar curves for different density contrast ratios.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2527fig9.eps} \end{figure}$ Figure 9: Fitting a damped sine wave to the observed oscillations of the loop apex. The symbols are the points obtained from the simulation, the solid line is the best fit damped sine wave. The damping time and period are both equivalent to those obtained from the main diagnostic.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{2527fg10.eps} \end{figure}$ Figure 10: Plot of the magnetic (solid line) and thermal (dashed line) pressure perturbations along a straight line at x=0 between y=2 and the top of the simulation domain for the same simulation and at the same time as Fig. 7.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{2527fg11.eps} \end{figure}$ Figure 11: Pattern of $\vert V_{\rm perp}\vert$ across the box for nearby reflecting boundary conditions, using the same physical parameters as used in the main simulations. The mode number is 5, and the driver period is 1.32, the observed period is 1.52.
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig1.eps} \end{figure}$	Figure 1: Alfvén speed vs. distance from tube axis for straight tube. For values of $\omega /k$ on the dashed line, no wave solutions exist. For values of $\omega /k$ on the dotted line, wave solutions exist everywhere. For values of $\omega /k$ on the dot dashed line, wave solutions only exist in the tube.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig2.eps} \end{figure}$	Figure 2: Alfvén speed vs. distance from tube axis for curved tube. The horizontal lines are plotted at the same points as in Fig. 1.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig3.eps} \end{figure}$	Figure 3: Contours of $V_{\rm perp}$ for a driver period of 0.48 at the termination of driving (t=144). The driver has excited a dominant eigenmode with a period of 0.51. Note that the pattern is highly asymmetric due to the footpoint driver. The mode number for this eigenmode is n=16.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{2527fig4.eps} \end{figure}$	Figure 4: Contours of $V_{\rm perp}$ for the longest wavelength simulated in this paper, with a driver period of 1.32. This contour is after the driving has stopped and the system is freely decaying. This figure was generated at t=168. The mode number for this eigenmode is n=5, and the driver has excited a dominant eigenmode with a period of 1.54.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig5.eps} \end{figure}$	Figure 5: Contours of $\vert V_{\rm perp}\vert$ for the same simulation and time as Fig. 4.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{2527fig7.eps} \end{figure}$	Figure 7: Contours of $\vec{V}_{\rm perp}$ at the end of the simulation shown in Fig. 3. Note that the pattern is now symmetric.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{2527fig8.eps} \end{figure}$	Figure 8: Decay constant vs. observed eigenmode period in dimensionless units for domain with velocity damping boundaries and a density contrast ratio of 10. This is one of a family of similar curves for different density contrast ratios.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{2527fig9.eps} \end{figure}$	Figure 9: Fitting a damped sine wave to the observed oscillations of the loop apex. The symbols are the points obtained from the simulation, the solid line is the best fit damped sine wave. The damping time and period are both equivalent to those obtained from the main diagnostic.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{2527fg10.eps} \end{figure}$	Figure 10: Plot of the magnetic (solid line) and thermal (dashed line) pressure perturbations along a straight line at x=0 between y=2 and the top of the simulation domain for the same simulation and at the same time as Fig. 7.
Open with DEXTER

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{2527fg11.eps} \end{figure}$	Figure 11: Pattern of $\vert V_{\rm perp}\vert$ across the box for nearby reflecting boundary conditions, using the same physical parameters as used in the main simulations. The mode number is 5, and the driver period is 1.32, the observed period is 1.52.
Open with DEXTER