The C/H ratio in Jupiter from the Voyager infrared investigation

From a selection of Voyager IRIS spectra corresponding to cloud-free areas of Jupiter, we have determined the CH/sub 4//H/sub 2/ volume ratio in the atmosphere of this planet as equal to (1.95 +- 0.22)10/sup -3/ which corresponds to 2.07 +- 0.24 times the solar value of Lambert (C/H = 4.7 x 10/sup -4/). Estimate of errors includes both instrument noise and systematic uncertainties. Implications of this result on the formation and evolution of Jupiter are discussed.