All Figures

$\begin{figure} \par\includegraphics[angle=90,width=6.8cm,clip]{AA3385Fig1} \end{figure}$ Figure 1: Systems of coordinates related to the particle propagation direction OZ_P and used in Sect. 2.1 to define the Stokes parameters.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.2cm,clip]{AA3385Fig2.eps} \end{figure}$ Figure 2: Orientations of H $\alpha$ line linear polarization for hydrogen excitation by collision with electrons moving along the solar vertical with energies lower or greater than $E_0~=~E_{\rm tov}$ . For $E~>~(<)~E_{\rm tov}$ , P is negative (positive) and the polarization direction is tangential (radial), i.e. perpendicular (parallel) to the flare to disk center direction.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{AA3385Fig3.eps} \end{figure}$ Figure 3: The 0.8-4.5 GHz radio spectrum observed during the June 15th 2001 flare by two Ondrejov radiospectrographs (0.8-2.0 GHz and 2.0-4.5 GHz range).
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In the text

$\begin{figure} \includegraphics[width=8.2cm,clip]{AA3385Fig4.ps} . \end{figure}$ Figure 4: Time variation of the Hard X-ray flux observed during the June 15th 2001 flare by HXRS, that also indicates electron beams. At any time, the highest flux corresponds to the lowest energy band.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig5.ps} \end{figure}$ Figure 5: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:34 UT on June 15th 2001 at location a (dark line on the lower left spectrum). The superposed two I+S (up) and I-S (down) spectral images in the spectrograph dispersion plane for one of the two Stokes parameters U or Q are shown on the left of the figure.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig6.ps} \end{figure}$ Figure 6: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:34 UT on June 15th 2001 at location a.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig7.ps} \end{figure}$ Figure 7: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:09 UT on June 15th 2001 at location a.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig8.ps} \end{figure}$ Figure 8: H $\beta$ line intensity (full line), linear polarization degree (dashed line) and orientation profiles (dashed line) observed at 10:09:09 UT on June 15th 2001 at location a.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig9.ps} \end{figure}$ Figure 9: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:48 UT on June 15th 2001 at location b.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig10.ps} \end{figure}$ Figure 10: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:48 UT on June 15th 2001 at location b.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig11.ps} \end{figure}$ Figure 11: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:23 UT on June 15th 2001 at location b.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig12.ps} \end{figure}$ Figure 12: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:23 UT on June 15th 2001 at location b.
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In the text

$\begin{figure} \par\includegraphics[width=5.4cm,clip]{AA3385Fig13.ps} \end{figure}$ Figure 13: Location of H $\alpha$ flare observed at Paris Observatory (Meudon) at 7:22 UT on July 18th 2000.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=14cm,clip]{AA3385Fig14.ps} \end{figure}$ Figure 14: H $\alpha$ line intensity, linear polarization degree and orientation profiles at five positions (seen on bottom left part of the figure) along the spectrograph slit. Superposed on the left are three pairs of associated I+S (up) and I-S (down) spectral images in the spectrograph dispersion plane for a transmission band of the grid. The Stokes parameter used in this figure could be either U or Q. Observation made at 7:22:52 UT on July 18th 2000.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=14cm,clip]{AA3385Fig15.ps} \end{figure}$ Figure 15: H $\beta$ line intensity, linear polarization degree and orientation profiles at five positions (seen on bottom left part of the figure) along the spectrograph slit. Observation made at 7:22:52 UT on July 18th 2000.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig16} \end{figure}$ Figure 16: Return current electron energy $E_{\rm R}$ as a function of the local electron number density $n_{\rm e}$ for various values of the beam initial energy flux $\Phi _{E}$ and electron beam initial energy E₀ in the model where the return current is formed by all background plasma electrons. Full line: E₀ = 10 keV, dashed line: E₀ = 20 keV. T and R are regions of respectively tangential and radial polarization. These regions are separated by full vertical lines. The dashed vertical line designates the energy of return current electrons corresponding to maximum polarization.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig17} \end{figure}$ Figure 17: Return current electron energy $E_{\rm R}$ as a function of the ratio of the beam initial energy flux $\Phi _{E}$ to the local electron number density $n_{\rm e}$ for two values of the electron beam initial energy E₀ in the model where the return current is formed by all background plasma electrons. Full line: E₀ = 10 keV, dashed line: E₀= 20 keV. T and R are regions of respectively tangential and radial polarization; these regions are separated by full horizontal lines. The dashed horizonal line designates the energy of return current electrons corresponding to maximum polarization.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig18} \end{figure}$ Figure 18: Return current electron energy $E_{\rm R}$ as a function of the local electron number density $n_{\rm e}$ for various values of the beam energy flux $\Phi _{E}$ and electron beam energy E₀ in the model with the return current formed by run-away electrons. The notations are the same as in Fig. 16.
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In the text

$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig19} \end{figure}$ Figure 19: Return current electron energy $E_{\rm R}$ as a function of of a ratio of the energy beam flux $\Phi _{E}$ and the local electron number density $n_{\rm e}$ for two values of the electron beam energy E₀ in the model with the return current formed by run-away electrons.The notations are the same as in Fig. 17.
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In the text

$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig20} \end{figure}$ Figure A.1: Intensity $I_{\Delta~\lambda}$ in the far wings of the H $\alpha$ line integrated over 20 nm as a function of distance y(in pixels) along the spectrograph entrance slit, at 10:07:34 UT. The y scale of the I+S image has been translated by -(142 +dy) pixels, where ${\rm d}y$ is a fraction of pixels. I(y) in full and thick line corresponds to the image I-S. The other plots represent $I_{\Delta~\lambda}(y-(142+{\rm d}y))$ given by the I+Simage. Three values of ${\rm d}y$ have been used, 0.(thin full line), +0.2 (thin dotted line)and +0.4 (thin dashed line).

In the text

$\begin{figure} \par\includegraphics[angle=90,width=6.8cm,clip]{AA3385Fig1} \end{figure}$	Figure 1: Systems of coordinates related to the particle propagation direction OZ_P and used in Sect. 2.1 to define the Stokes parameters.
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$\begin{figure} \par\includegraphics[angle=90,width=8.2cm,clip]{AA3385Fig2.eps} \end{figure}$	Figure 2: Orientations of H $\alpha$ line linear polarization for hydrogen excitation by collision with electrons moving along the solar vertical with energies lower or greater than $E_0~=~E_{\rm tov}$ . For $E~>~(<)~E_{\rm tov}$ , P is negative (positive) and the polarization direction is tangential (radial), i.e. perpendicular (parallel) to the flare to disk center direction.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{AA3385Fig3.eps} \end{figure}$	Figure 3: The 0.8-4.5 GHz radio spectrum observed during the June 15th 2001 flare by two Ondrejov radiospectrographs (0.8-2.0 GHz and 2.0-4.5 GHz range).
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$\begin{figure} \includegraphics[width=8.2cm,clip]{AA3385Fig4.ps} . \end{figure}$	Figure 4: Time variation of the Hard X-ray flux observed during the June 15th 2001 flare by HXRS, that also indicates electron beams. At any time, the highest flux corresponds to the lowest energy band.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig6.ps} \end{figure}$	Figure 6: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:34 UT on June 15th 2001 at location a.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig7.ps} \end{figure}$	Figure 7: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:09 UT on June 15th 2001 at location a.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig8.ps} \end{figure}$	Figure 8: H $\beta$ line intensity (full line), linear polarization degree (dashed line) and orientation profiles (dashed line) observed at 10:09:09 UT on June 15th 2001 at location a.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig9.ps} \end{figure}$	Figure 9: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:48 UT on June 15th 2001 at location b.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig10.ps} \end{figure}$	Figure 10: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:07:48 UT on June 15th 2001 at location b.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig11.ps} \end{figure}$	Figure 11: H $\alpha$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:23 UT on June 15th 2001 at location b.
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$\begin{figure} \par\includegraphics[angle=90,width=8.8cm,clip]{AA3385Fig12.ps} \end{figure}$	Figure 12: H $\beta$ line intensity (full line), linear polarization degree (dotted line) and orientation profiles (dashed line) observed at 10:09:23 UT on June 15th 2001 at location b.
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$\begin{figure} \par\includegraphics[width=5.4cm,clip]{AA3385Fig13.ps} \end{figure}$	Figure 13: Location of H $\alpha$ flare observed at Paris Observatory (Meudon) at 7:22 UT on July 18th 2000.
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$\begin{figure} \par\includegraphics[angle=90,width=14cm,clip]{AA3385Fig15.ps} \end{figure}$	Figure 15: H $\beta$ line intensity, linear polarization degree and orientation profiles at five positions (seen on bottom left part of the figure) along the spectrograph slit. Observation made at 7:22:52 UT on July 18th 2000.
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$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig18} \end{figure}$	Figure 18: Return current electron energy $E_{\rm R}$ as a function of the local electron number density $n_{\rm e}$ for various values of the beam energy flux $\Phi _{E}$ and electron beam energy E₀ in the model with the return current formed by run-away electrons. The notations are the same as in Fig. 16.
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$\begin{figure} \par\includegraphics[width=7.2cm,clip]{AA3385Fig19} \end{figure}$	Figure 19: Return current electron energy $E_{\rm R}$ as a function of of a ratio of the energy beam flux $\Phi _{E}$ and the local electron number density $n_{\rm e}$ for two values of the electron beam energy E₀ in the model with the return current formed by run-away electrons.The notations are the same as in Fig. 17.
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