All Figures

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig1.ps} \end{figure}$ Figure 1: Meudon spectroheliogram in CaII K1v (blue wing of CaII K 393.4 nm), on 2004 July 14 at 07:36 UT, showing NOAA 0644. The black box corresponds to the MSDP field of view.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig2.ps} \end{figure}$ Figure 2: SOHO/MDI magnetogram on 2004 July 15 at 06:23 UT, showing NOAA 0644. We observed with the MSDP the eastern part of the spot (the black box corresponds to the MSDP field of view); the magnetic field found by MDI in this spot was between -1000 and 1000 Gauss, in agreement with our results (courtesy SOHO/MDI).
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig3.ps} \end{figure}$ Figure 3: Effect of image accumulation on the determination of magnetic fields ( top: after summation of 20 determinations after destretching single; bottom: single determination). The field of view is $15\hbox {$^{\prime \prime }$ }\times 86\hbox {$^{\prime \prime }$ }$ . A single determination requires a couple of images I+V and I-V.
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In the text

$\begin{figure} \par\includegraphics[width=11.5cm,clip]{4963fig4.ps} \end{figure}$ Figure 4: Quiet area $58\hbox {$^{\prime \prime }$ }\times 9\hbox {$^{\prime \prime }$ }$ at t=31 mn. From top to bottom: a) magnetic field B_// at 144 mÅ (high photosphere). North polarities in white, South in dark; b) intensity fluctuations (Filigree, bright features) at 144 mÅ (high photosphere); c) line-of-sight velocity V_// at 144 mÅ upflows are represented in white and downflows in dark (high photosphere); d) continuum intensity of NaD1 (first channel of the MSDP with a small variation in wavelength giving a darker part in the bottom of that figure) (photosphere). Isocontours of B_// at 144 mÅ are plotted for $\pm$ 150, $\pm$ 300 and $\pm$ 600 Gauss. Magnetic concentrations are strongly correlated to bright features and filigree, and also to intergranular lanes (see right of the figure).
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig5.ps}\end{figure}$ Figure 5: Velocities versus magnetic field (absolute value) at 288 mÅ (170 km), 5mn filtered for |B_//|>60 Gauss. Positive velocity denotes downflow.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig6.ps} \end{figure}$ Figure 6: Intensity at 144 mÅ versus magnetic field (absolute value) at 288 mÅ (170 km) for |B_//|>60 Gauss.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig7.ps} \end{figure}$ Figure 7: Velocity at 288 mÅ (170 km) versus intensity at 144 mÅ for |B_//| <200 Gauss (dots) and |B_//|>500 Gauss (diamonds). Positive velocity denotes downflow.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig8.ps}\end{figure}$ Figure 8: Observation at time t=14 mn, field of view of $87\hbox {$^{\prime \prime }$ }\times 9\hbox {$^{\prime \prime }$ }$ . From top to bottom: a) gradient of the absolute magnetic field between 144 and 288 mÅ. Positive gradient (increasing field with height) in white, negative in dark; b) magnetic field at 288 mÅ (170 km), after destretching and summing 20 pairs of images I+V, I-V. North polarities in white, South in dark; c) magnetic field at 144 mÅ (327 km), after destretching and summing 20 pairs of images I+V, I-V; d) intensity at 144 mÅ showing bright features and filigree, with the gradient of the absolute value of the magnetic field (this is the difference between the absolute value of the magnetic field at 144 and 288 mÅ, after reduction of the size of the pixel to 1 $^{\prime \prime }$ in order to reduce the noise). Isocontours for $\pm$ 13 Gauss, $\pm$ 40 Gauss, ${\pm 66}$ Gauss, ${\pm 94}$ Gauss, ${\pm 120}$ Gauss, ${\pm 146}$ Gauss, ${\pm 173}$ Gauss, ${\pm 200}$ Gauss, ${\pm 227}$ Gauss, ${\pm 253}$ Gauss) with positive gradient (magnetic field increasing with height in absolute value) for black and negative gradient (magnetic field decreasing with height) for white; e) intensity at 144 mÅ showing bright features and filigree, with isocontours of the the magnetic field (isocontours for ${\pm 80}$ Gauss, ${\pm 240}$ Gauss, ${\pm 400}$ Gauss, ${\pm 560}$ Gauss, ${\pm 720}$ Gauss, ${\pm 880}$ Gauss, ${\pm 1040}$ Gauss, ${\pm 1200}$ Gauss, ${\pm 1360}$ Gauss, ${\pm 1520}$ Gauss).
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In the text

$\begin{figure} \par\includegraphics[width=12cm]{4963fig9.ps} \end{figure}$ Figure 9: Magnetic bright feature (A) time evolution, coordinates (463, 18) where V_// <0 (downward) and B_// >0. B_// in Gauss and V_// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig10.ps} \end{figure}$ Figure 10: Magnetic bright feature (B) time evolution, coordinates (784, 43) where V_//<0 (downward) and B_// <0. B_// in Gauss and V_// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig11.ps} \end{figure}$ Figure 11: Time evolution of different parameters of the Moving Magnetic Feature (MMF): B_// in Gauss and V_// in m/s. Top left: MMF displacement in arcsec during the sequence; top right: MMF magnetic field at 144 mÅ time evolution which is fairly constant during the sequence; bottom left: core intensity time evolution of the MMF which is is constant during the sequence; bottom right: MMF Doppler velocity at 144 mÅ, time evolution. We note strong modification of the downflow amplitude between -0.6 km s^-1 to -1.2 km s^-1 during the sequence.
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In the text

$\begin{figure} \par\includegraphics[width=12.5cm,clip]{4963fig12.ps} \end{figure}$ Figure 12: Moving Magnetic Feature (MMF), dark feature, time evolution (magnetic field). Field of view is $15 \hbox{$^{\prime\prime}$ }\times 5\hbox{$.\!\!^{\prime\prime}$ }5$ , time step is 2 mn. North polarities in white, South in dark.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig1.ps} \end{figure}$	Figure 1: Meudon spectroheliogram in CaII K1v (blue wing of CaII K 393.4 nm), on 2004 July 14 at 07:36 UT, showing NOAA 0644. The black box corresponds to the MSDP field of view.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig2.ps} \end{figure}$	Figure 2: SOHO/MDI magnetogram on 2004 July 15 at 06:23 UT, showing NOAA 0644. We observed with the MSDP the eastern part of the spot (the black box corresponds to the MSDP field of view); the magnetic field found by MDI in this spot was between -1000 and 1000 Gauss, in agreement with our results (courtesy SOHO/MDI).
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$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig3.ps} \end{figure}$	Figure 3: Effect of image accumulation on the determination of magnetic fields ( top: after summation of 20 determinations after destretching single; bottom: single determination). The field of view is $15\hbox {$^{\prime \prime }$ }\times 86\hbox {$^{\prime \prime }$ }$ . A single determination requires a couple of images I+V and I-V.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig5.ps}\end{figure}$	Figure 5: Velocities versus magnetic field (absolute value) at 288 mÅ (170 km), 5mn filtered for \|B_//\|>60 Gauss. Positive velocity denotes downflow.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig6.ps} \end{figure}$	Figure 6: Intensity at 144 mÅ versus magnetic field (absolute value) at 288 mÅ (170 km) for \|B_//\|>60 Gauss.
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$\begin{figure} \par\includegraphics[width=8cm,clip]{4963fig7.ps} \end{figure}$	Figure 7: Velocity at 288 mÅ (170 km) versus intensity at 144 mÅ for \|B_//\| <200 Gauss (dots) and \|B_//\|>500 Gauss (diamonds). Positive velocity denotes downflow.
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$\begin{figure} \par\includegraphics[width=12cm]{4963fig9.ps} \end{figure}$	Figure 9: Magnetic bright feature (A) time evolution, coordinates (463, 18) where V_// <0 (downward) and B_// >0. B_// in Gauss and V_// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively.
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$\begin{figure} \par\includegraphics[width=12cm,clip]{4963fig10.ps} \end{figure}$	Figure 10: Magnetic bright feature (B) time evolution, coordinates (784, 43) where V_//<0 (downward) and B_// <0. B_// in Gauss and V_// in m/s. In the bottom plots, dot and solid lines represent depth at 288 and 144 mÅ respectively.
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$\begin{figure} \par\includegraphics[width=12.5cm,clip]{4963fig12.ps} \end{figure}$	Figure 12: Moving Magnetic Feature (MMF), dark feature, time evolution (magnetic field). Field of view is $15 \hbox{$^{\prime\prime}$ }\times 5\hbox{$.\!\!^{\prime\prime}$ }5$ , time step is 2 mn. North polarities in white, South in dark.
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