Oxygen-to-neon abundance ratio in the solar corona

The oxygen-to-neon abundance ratio in the solar corona is determined to be 4.7 + or - 1.5 on the basis of a relatively model-independent analysis utilizing 25 separate measurements of the O VIII to Ne IX resonance line ratio. The stated uncertainty includes random and possible systematic experimental error in the data but does not include possible error in the calculated flux ratios which have been fitted to the observations. This abundance ratio is smaller than most published results based upon EUV or X-ray observations but is in good agreement with direct measurements of flare cosmic rays.