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Presented in this manuscript are observations exploring vortices with diameters larger than 1000km on Jupiter and Saturn. These images are taken from the Imaging Science Subsystem onboard the Cassini Spacecraft. The analyses of Saturn’s vortices show that there are significantly more vortices in the Southern Hemisphere (SH) than in the Northern Hemisphere (NH) during the time from 2004 to 2010. In...
The Cassini Imaging Science Subsystem (ISS) and Composite Infrared Spectrometer (CIRS) reported a North Equatorial Belt (NEB) wave in Jupiter's atmosphere from optical images [Porco, C.C., and 23 colleagues, 2003. Science 299, 1541–1547] and thermal maps [Flasar, F.M., and 39 colleagues, 2004. Nature 427, 132–135], respectively. The connection between the two waves remained uncertain because the two...
Observations suggest that moist convection plays an important role in the large-scale dynamics of Jupiter's and Saturn's atmospheres. Here we use a reduced-gravity quasigeostrophic model, with a parameterization of moist convection that is based on observations, to study the interaction between moist convection and zonal jets on Jupiter and Saturn. Stable jets with approximately the same width and...
Using the sequence of 70-day continuum-band (751 nm) images from the Cassini Imaging Science System (ISS), we record over 500 compact oval spots and study their relation to the large-scale motions. The ~100 spots whose vorticity could be measured-the large spots in most cases-were all anticyclonic. We exclude cyclonic features (chaotic regions) because they do not have a compact oval shape, but we...
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