Abstract
Theoretical Ca X electron temperature sensitive emission line ratios, derived using electron excitation rates interpolated from accurateR-matrix calculations, are presented forR 1 =I(419.74 A)/I(574.02 A,),R 2 =I(411.65 A)/I(574.02 A),R 3 =I(419.74 A)/I(557.75 A), andR 4 =I(411.65 A)/I(557.75 A). A comparison of these with observational data for three solar flares, obtained by the Naval Research Laboratory's S082A slitless spectrograph on boardSkylab, reveals good agreement between theory and observation forR 1 andR 3 in one event, which provides limited support for the accuracy of the atomic data adopted in the analysis. However, in the other flares the observed values ofR 1 –R 4 are much larger than the theoretical high-temperature limits, which is probably due to blending of the 419.74 A line with Civ 419.71 A, and 411.65 A with possibly Ciii 411.70 A.
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