All Figures

$\begin{figure} \par\includegraphics[width=16cm,clip]{9231fig01.eps}\end{figure}$ Figure 1: Broadband image of part of the active region AR10875 observed on April 26, 2006 at heliocentric angle $\vartheta =36\hbox {$^\circ $ }$ . The image is from time t=15.4 min after the start of the series. The rectangles, denoted by A, B, B $^\prime$ , C, and D, are the areas of interest (AOIs) to be analyzed and discussed in the present work.
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In the text

$\begin{figure} \par\includegraphics[width=16cm,clip]{9231fig02.eps}\end{figure}$ Figure 2: Narrow-band image corresponding to Fig. 1 in H $\alpha$ at +0.5 Å off line center. The same areas of interest are indicated as in Fig. 1 by the rectangles. The short lines with the numbers 7-9 indicate locations of the space-time slices that are the subjects of Figs. 7 to 9. The surge in AOI A occurred at a later time. So this figure is a montage with the surge mounted on it from time t=40.9 min during the series.
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In the text

$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9231fig03.eps}\end{figure}$ Figure 3: Space-time image of surge in AOI A at H $\alpha$ +0.5 Å off line center, starting at 14.7 min after the beginning of the sequence. Along the spatial axis and at each time step, the minimum intensities across the surge at this wavelength are given.
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In the text

$\begin{figure} \par\includegraphics[width=17.6cm,clip]{9231fig04.eps}\end{figure}$ Figure 4: Simultaneous flash event on AOI B and B $^\prime$ with projected distance of 13.7 Mm. A pair of simultaneous, short brightenings was recorded at t=52.2 min. Top row from B $^\prime$ , bottom row from B. The tiles from left to right correspond to two successive H $\alpha$ scans. Upper x-axis is scaled to the wavelength of each 2D filtergram tile. Scanning time is numbered on the lower x-axis where t=0 corresponds to the beginning of the scan at 08:44 UT. The integration time for each spectral position is $\approx$ 1 s, while the delay between two scans is $\approx$ 3 s (vertical dashed line). Each spectrogram on B is normalized with the background profile (see Fig. 5) to emphasize the flash event. Neither the previous nor the following scan of the two presented exhibited any emission. The second scan (right half size of the figure) still shows some emission on the same position. White arrows correspond to the position of the three different profiles shown in Fig. 5.
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In the text

$\begin{figure} \par\includegraphics[width=8.75cm,clip]{9231fig05.eps}\end{figure}$ Figure 5: H $\alpha$ profiles from the flash event. Each profile corresponds to an average over three pixels around the three selected points where the emission is highest in the blue wing, at central wavelength, and in the red wing, corresponding to the white arrows in Fig. 4 (left half) at x= [3.7, 2.8, 1.1] Mm, respectively. For comparison the quiet Sun profile, from a nearby quiet area outside the FOV, is also shown. Background profile corresponds to the mean from previous and following scans, where no brightening was found. The emission profile at 1.1 Mm reaches an intensity >1.1 of the quiet Sun continuum intensity.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{9231fig06.eps}\end{figure}$ Figure 6: Average temporal power spectra of velocity from AOI C in Figs. 1 and 2 before filtering (dashed) and after pass-band filtering (solid).
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{9231fig07.eps}\end{figure}$ Figure 7: Example of space-time slices, of 1 $.\!\!^{\prime\prime}$ 1 width, from AOI C in Figs. 1 and 2. From left to right: LOS velocity, H $\alpha$ line center intensity, and intensity differences at H $\alpha$ +0.5 Å off line center: I_0.5(t_i+1)-I_0.5(t_i) with cadence of $\Delta t=t_{i+1}-t_{i}$ = 22 s. The intensity differences in the right column are shifted up by 11 s. They are referred to as $\Delta I_{0.5}$ slices in the text.
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In the text

$\begin{figure} \par\includegraphics[width=6.9cm,clip]{9231fig08.eps}\end{figure}$ Figure 8: Example of space-time slices, of 1 $.\!\!^{\prime\prime}$ 1 width, from AOI D. Same ordering as in Fig. 7.
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In the text

$\begin{figure} \par\includegraphics[width=10.4cm,clip]{9231fig09.eps}\end{figure}$ Figure 9: We show a selected part of space-time slices from AOI C with slice width of 2 $.\!\!^{\prime\prime}$ 2 showing examples of wave propagation along sinuous channels ( left, 1-8) and lateral displacements ( right, chequer-board pattern 1 $^\prime$ -5 $^\prime$ ), see text. Left column: H $\alpha$ line center intensity fluctuations; right column: intensity differences at H $\alpha$ line center: $I_{\rm LC}(t_{i+1})-I_{\rm LC}(t_{i})$ with cadence of $\Delta t=t_{i+1}-t_{i}$ = 22 s, referred to as $\Delta I_{\rm LC}$ slices in the text.
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In the text

$\begin{figure} \par\includegraphics[width=8.45cm,clip]{9231fig10.eps}\end{figure}$ Figure 10: Parts of the two slices ``5'' ( lower) and ``7'' ( upper) in Fig. 9. The magnetic channel along which the wave propagates is indicated by the black line in lower slice. Distance of short tickmarks corresponds to 0 $.\!\!^{\prime\prime}$ 5.
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In the text

$\begin{figure} \par\includegraphics[width=16cm,clip]{9231fig01.eps}\end{figure}$	Figure 1: Broadband image of part of the active region AR10875 observed on April 26, 2006 at heliocentric angle $\vartheta =36\hbox {$^\circ $ }$ . The image is from time t=15.4 min after the start of the series. The rectangles, denoted by A, B, B $^\prime$ , C, and D, are the areas of interest (AOIs) to be analyzed and discussed in the present work.
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$\begin{figure} \par\includegraphics[width=8.5cm,clip]{9231fig03.eps}\end{figure}$	Figure 3: Space-time image of surge in AOI A at H $\alpha$ +0.5 Å off line center, starting at 14.7 min after the beginning of the sequence. Along the spatial axis and at each time step, the minimum intensities across the surge at this wavelength are given.
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$\begin{figure} \par\includegraphics[width=8.4cm,clip]{9231fig06.eps}\end{figure}$	Figure 6: Average temporal power spectra of velocity from AOI C in Figs. 1 and 2 before filtering (dashed) and after pass-band filtering (solid).
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$\begin{figure} \par\includegraphics[width=6.9cm,clip]{9231fig08.eps}\end{figure}$	Figure 8: Example of space-time slices, of 1 $.\!\!^{\prime\prime}$ 1 width, from AOI D. Same ordering as in Fig. 7.
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$\begin{figure} \par\includegraphics[width=8.45cm,clip]{9231fig10.eps}\end{figure}$	Figure 10: Parts of the two slices ``5'' ( lower) and ``7'' ( upper) in Fig. 9. The magnetic channel along which the wave propagates is indicated by the black line in lower slice. Distance of short tickmarks corresponds to 0 $.\!\!^{\prime\prime}$ 5.
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