Intensity ratio of fine structure components of resonance lines of hydrogen-like ions in the plasma of the solar corona

For hydrogen-like ions O 8 Ne 10, Mg 12, Si 16, Ca 20, Fe 24 in the solar corona, the intensity ratio kappa=I(1ssub(1/2)-2psub(1/2))/I(1ssub(1/2)-2psub(3/2)) for the fine structure components of the Lsub(α) line has been calculated as a function of the proton density. Probabilities of transitions are obtained with account for the interaction of protons with multi-charge ions. The value of kappa is sensitive to the variations of the proton density in the interval from 1011 cm-3 (O 8) to 1017 cm-3 (Fe 26)