Log10τ0(Hα) versus log 10E(Hα). Integral intensities E(Hα) are in units erg / cm2/ s / sr. Results from the grid of simple 1D isobaric and isothermal models of Heinzel et al. (1994) are plotted with the “+” symbols. Models with different temperatures and geometrical thicknesses of the prominence were used to construct the plot. A clear trend can be seen, thus the points were fitted using a polynomial function (full line).
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