Theoretical emission line strengths for Ne VII compared to EUV solar observations

Theoretical electron-temperature-sensitive Ne vii emission line ratios, calculated using accurate R-matrix electron impact excitation rates, are presented for R ₁ = I(895.2 Å)/I(465.2 Å), R ₂ = I(561.7 Å)/I(465.2 Å) and R ₃ = I(564.5 Å)/I(465.2 Å). A comparison of these with observational data for several solar features obtained with the Harvard S-055 spectrometer on board Skylab reveals good agreement between theory and experiment. This provides observational support for the accuracy of the atomic physics adopted in the calculations, and the methods employed in the derivation of the theoretical diagnostics.