Abstract
Theoretical O IV electron density sensitive emission-line ratios, determined using electron impact excitation rates calculated with the R-matrix code, are presented for R 1 = I(1407.4 A)/I(1401.2 A), R 2 = I(1404.8 A)/I(1401.2 A), R 3 = I(1399.8 A)/I(1401.2 A), and R 4 = I(1397.2 A)/I(1401.2 A). The observed values of R 1 -R 4 , measured from high-resolution spectra obtained with the International Ultraviolet Explorer (IUE) satellite, lead to electron densities that are compatible, and which are also in good agreement with those deduced from line ratios in other species. This provides observational support for the accuracy of the atomic data adopted in the present calculations
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