Abstract
Prominence observations made simultaneously with the MSDP spectrograph and with the coronagraph at Pic du Midi are presented. The existence of a coronal cavity is discussed. 2D-maps of Ha intensities and the line-of-sight velocities have been obtained. The behaviour of the velocity field suggests the presence of twists along flux ropes or shear motions. Further, using a probabilistic approach to the Hα-line formation, we estimate the range of temperatures, electron densities and optical thicknesses in different parts of the prominence by fitting the observed Ha intensity profiles.
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