37th DPS Meeting, 4-9 September 2005
Session 30 Outer Planets
Poster, Tuesday, September 6, 2005, 6:00-7:15pm, Music Lecture Room 5

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[30.12] The Atmosphere of Jupiter from Voyager's and Cassini's Infrared Observations

K. I. Matcheva (University of Florida), P. J. Gierasch, B. J. Conrath (Cornell University)

We perform a comparative study of the structure of Jupiter's troposphere and low stratosphere based on the analysis of the Voyager/IRIS and the Cassini/CIRS observations of the Jovian infrared emission. Our results show changes in the zonal mean properties of the atmosphere, which are probably related to seasonal effects. These changes are consistent with the changed appearance of the planet at visible wavelengths. We use the brightness temperature of Jupiter at 1392 cm-1 (7.18 \mum) to determine the depth of the top cloud layer in the Jovian troposphere and an ammonia ice indicator \alpha=TB(\nu=1040) -TB(\nu=1060) (Wong et al. 2004) to look for correlations with the derived cloud structure. The results from the analysis of the Voyager/IRIS observations are compared with the atmospheric opacity of the atmosphere at 5 \mum and 45 \mum derived from the same data set (Conrath and Gierasch 1986). We perform a similar analysis for the structure of the Great Red Spot and map the cloud opacity, the temperature and the alpha parameter in the vicinity of the GRS.

Conrath, B. J, and P. J. Gierasch 1986. Retrieval of ammonia abundances and cloud opacities on Jupiter from Voyager IRIS spectra. Icarus v. 67, p. 444-455.

Wong, M. H, G. L. Bjoraker, M. D. Smith, F. M. Flasar, C. A. Nixon 2004. Identification of the 10-\micron ammonia ice feature on Jupiter. Planetary and Space Science, v. 52, p. 385-395.

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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.