Abstract
New electron impact collision rates are presented for transitions between the 10 lowest states of Ca XVII. These data are then used to predict Ca XVII level populations and emission-line intensity ratios for electron densities and temperatures appropriate to solar flares. A comparison is made with observations obtained with the NRL spectro-heliograph aboard Skylab. For the intercombination to resonance line ratio the agreement is good. For other triplet to singlet ratios agreement is less satisfactory, possibly due to uncertainties in the observational data.
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