Characterization of Jupiter's Atmosphere from Galileo and Earth-Based Observations During the Ganymede-1 and Ganymede-2 Orbit Encounters

Astronomy and Astrophysics – Astronomy

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Scientific paper

Galileo remote sensing data are examined in the context of an extensive set of earth-based observations supporting the Ganymede-1 and Ganymede-2 encounters. Movies of the Great Red Spot (GRS) in reflected sunlight, show large-scale flow; for example, the circular feature northwest of the GRS during G1 was one of several high-altitude systems moving westward with respect to the GRS. The southern part of the clear band surrounding the GRS was narrower at 5 mu m than 8.57 mu m, suggesting more cloud cover at depth than at the NH_3 condensation level; this region was also warmer in the troposphere. High-altitude particles were found in the flow pattern ``trailing'' the GRS. The real-time NIMS G1 spectra sampled a region only moderately bright at 5-mu m, not a classical ``hot spot''. Synoptic middle-infrared spectra of this region complement NIMS spectra of the deep troposphere by constraining abundances of NH_3 and PH_3 at higher altitudes. The southern part of the North Equatorial Belt, observed by both NIMS spectra and PPR radiometry, was very active, generating classical bright ``plumes'' and dark ovals (``barges'') for the first time in many months. A long-term program will continue to observe potential targets for the Galileo's atmospheric investigation.

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