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Joint Cassini, Galileo and ground-based infrared observations of Jupiter's atmosphere

Orton, G., Fisher, B., Barnard, L., Edberg, S., Martin, T., Spilker, L., Tamppari, L., Ustinov, E., Harrington, J., Conrath, B., Gierasch, P., Deming, D., Flasar, F. M., Kunde, V., Achterberg, R., Bjoraker, G., Brasunas, J., Carlson, R., Jennings, D., Nixon, C., Pearl, J., Romani, P., Samuelson, R., Simon-Miller, A., Smith, M., Abbas, M., Ade, Peter A. R., Barucci, A., Bezard, B., Courtin, R., Coustenis, A., Gautier, D., Lellouch, E., Marten, A., Calcutt, S., Irwin, P., Read, P., Taylor, F., Owen, T., Cesarsky, C., Ferrari, C., Meyer, J. P., Travis, L., Coradini, A., Prangee, R., Grossman, K. and Spencer, J. 2001. Joint Cassini, Galileo and ground-based infrared observations of Jupiter's atmosphere. Presented at: DPS 33rd meeting of the American Astronomical Society, New Orleans, LA, USA, 27 November-1 December 2001.

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During the simultanous Galileo and Cassini encounter with Jupiter in December, 2000, and January, 2001, data on its atmosphere were obtained simultaneously by (1) Galileo's Photopolarimeter-Radiometer (PPR) at 27 microns, (2) Cassini's Composite Infrared Spectrometer (CIRS) between 7 and 16 microns, and (3) ground-based imaging from the NASA IRTF between 5 and 24 microns. These data sets mapped temperature structure, minor and trace constituent abundances and the NH>3< condensate cloud field. Features observed by the three sets of data included the Great Red Spot (GRS), the merged white oval ``BA'', and 5-micron hot spots. In addition, the IRTF data provided (a) contextual information for planetary-scale and regional phenomena, such as thermal waves and polar airmasses, as well as (b) a study of the evolution of various phenomena. The GRS remains the coldest feature in Jupiter's upper troposphere at temperate or equatorial latitudes, and it is consistent with an upwelling cyclonic vortex. A warm region remains semi-permanently associated with it to the south. Little thermal variability is detectable that can be associated with the 5-micron hot spots. Jupiter exhibits seasonal variability in its stratosphere, and the ``quasiquadrennial oscillation'' of the last 12 years dominates the time variability of the stratosphere. Greater than normal abundances of NH>3< gas are associated with regions of substantial cloudiness. The meridional variability of zonally averaged para-H2 abundances is similar to that observed by Voyager IRIS at Jupiter; it is more abundant in the Great Red Spot than in surrouding regions. Implications of these and other observations will be discussed. This work was supported by NASA grants to JPL, GSFC and Cornell, as well as the Galileo and Cassini projects.

Item Type: Conference or Workshop Item (Poster)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Additional Information: Abstract published in the Bulletin of the American Astronomical Society Volume 33 (3), 2001 Session 9. Cassini and Galileo at Jupiter Posters
Last Modified: 04 Jun 2017 04:42

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