Infrared polar brightening on Jupiter: III. Spectrometry from the Voyager 1 IRIS experiment

Spectra from the Voyager 1 IRIS experiment confirm the existence of enhanced infrared emission near Jupiter's north magnetic pole in March 1979. The spectral characteristics of the enhanced emission are consistent with a Planck source function. A temperature-pressure profile is derived for the region near the north magnetic pole, from which quantitative abundance estimates of minor species are made. Some species previously detected on Jupiter, including CH 3D, C 2H 2 and C 2H 6, have been observed again near the pole. Newly discovered species, not previously observed on Jupiter, include C 2H 4, C 3H 4, and C 6H 6. All of these species except CH 3D appear to have enhanced abundances at the north polar region with respect to midlatitudes. Upper limits are determined for C 4H 2 and C 3H 8. The quantitative results are compared with model calculations based on ultraviolet results from the IUE satellite. The plausibility of the C 6H 6 identification in discussed in terms of the literature on C 2H 2 polymerization. The relation of C 6H 6 to cuprene is also discussed.