Abstract
SMM data from the Corograph/Polarimeter experiment giving intensities of Hα and continuum emission in eight erupting prominences are analyzed to obtain the physical conditions in the regions of Hα emission. Since the Hα intensity depends upon three unknowns whereas only two independent observations are available, it is necessary to assume one additional condition in order to obtain unique solutions. Solutions are chosen that give the maximum expansion of the prominence volume as reflected by minimum values of the electron density. These solutions correspond closely with those giving the best agreement between the gas pressure in the prominence and the ambient coronal pressure. Electron densities are found to be of the order of 108 cm-3 at temperatures near 2 × 104 K.
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