Cassini, Galileo, and Ground-Based Observations of Jupiter's Thermal Emission During the Joint Spacecraft Encounter

Details Cassini, Galileo, and Ground-Based Observations of Jupiter's Thermal Emission During the Joint Spacecraft Encounter Cassini, Galileo, and Ground-Based Observations of Jupiter's Thermal Emission During the Joint Spacecraft Encounter

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm...p51a07o&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #P51A-07

Physics

5700 Planetology: Fluid Planets, 5704 Atmospheres--Composition And Chemistry, 5707 Atmospheres--Structure And Dynamics

Scientific paper

The temperature structure and the distribution of clouds and minor constituents in Jupiter's atmosphere can be derived from its thermal spectrum. Data from both Galileo's Photopolarimeter-Radiometer (PPR) at 27 μ m, Cassini's Composite Infrared Spectrometer (CIRS) between 7 and 16 μ , and ground-based imaging from the NASA Infrared Telescope Facility (IRTF) between 5 and 24 μ m provide information on temperature structure, the distribution of minor and trace constituents and the NH3 condensate cloud field. Targets for the three sets of data included the Great Red Spot (GRS), the merged white oval ``BA'' and 5-μ m hot spots. In addition, the IRTF data provided contextual information for planetary-scale phenomena, such as thermal waves, and regional properties (e.g. polar phenomena), as well as a longitudinal study of the evolution of various phenomena. The GRS remains the coldest location in Jupiter's upper troposphere and 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-μ m hot spots. Jupiter exhibits seasonal variability in its stratopshere, and the ``quasiquadrennial oscillation'' of the last 12 years dominates the meridional organization of the stratosphere. This work was supported by NASA grants to JPL, GSFC and Cornell, as well as the Galileo and Cassini projects.

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