Abundances of ammonia and carbon disulfide in the Jovian stratosphere following the impact of comet ShoemakerLevy 9

Radiative transfer-scattering models were used to fit the Hubble Space Telescope UV spectroscopic observations of Jupiter taken 2.5 hours after the impact of fragment G of comet P/Shoemaker-Levy 9. They yield abundances for NH3 and CS2 of (0.25-1.3)x1016cm -2 and (0.43-1.1)x1015cm -2, respectively, at unit optical depth level in the part of the atmosphere above the G-impact site. This range in the abundances is caused by the uncertainty in the composition of the aerosol material and the atmospheric pressure level where the aerosol unit optical depth in the UV occurs. The upper limits of H2S, PH3, C2H2, and C6H6 at the unit optical depth level are 1.2x10•6cm -2, 3.3x1014cm -2, 1.0x1017cm -2 , and 3.3x1014cm -2, respectively. The abundance of NH3 and the upper end of the CS2 abundance range are now found to be each approximately a factor of two lower than was reported previously [Noll et al., 1995], and H2S is not detected.