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Iron and calcium abundances in solar flares from the multitemperature analysis of X-ray spectra

A generalized method of calculating the distribution of the emission measure with temperature (DEM) for optically thin plasma has been developed. The method simultaneously uses line flux ratios in addition to line fluxes. When a ratio of lines from the same element is used, the resulting DEM is independent of this elemenťs abundance. The method has been applied to derive the absolute abundances of…