Saturn's Atmosphere at 1–10 Kilometer Resolution

Ingersoll, Andrew P.; Ewald, S. P.; Sayanagi, Kunio M.; Blalock, John J.

doi:10.1029/2018gl079255

Cited by 8 publications

(10 citation statements)

References 21 publications

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“…Two sets of extremely long, curved features were detected near the edges of a southwestern extension of a dark blue-gray region associated with high 5-μm radiances at the southern edge of the NEB. Long, sinuous parallel streaks were detected, some with nearly sinusoidal lateral variability, that were analogous to features observed by the highest-resolution imaging of Saturn's atmosphere by Cassini (Ingersoll et al, 2018). No waves were detected south of 7°S that were not associated with larger vortices, such as the GRS.…”

Section: Discussionsupporting

confidence: 63%

A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam

Orton

Tabataba‐Vakili

Eichstädt

et al. 2020

Preprint

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In the first 20 orbits of the Juno spacecraft around Jupiter, we have identified a variety of wave-like features in images made by its public-outreach camera, JunoCam. Because of Juno's unprecedented and repeated proximity to Jupiter's cloud tops during its close approaches, JunoCam has detected more wave structures than any previous surveys. Most of the waves appear in long wave packets, oriented east-west and populated by narrow wave crests. Spacing between crests were measured as small as 30 km, shorter than any previously measured. Some waves are associated with atmospheric features, but others are not ostensibly associated with any visible cloud phenomena and thus may be generated by dynamical forcing below the visible cloud tops. Some waves also appear to be converging, and others appear to be overlapping, possibly at different atmospheric levels. Another type of wave has a series of fronts that appear to be radiating outward from the center of a cyclone. Most of these waves appear within 5°of latitude from the equator, but we have detected waves covering planetocentric latitudes between 20°S and 45°N. The great majority of the waves appear in regions associated with prograde motions of the mean zonal flow. Juno was unable to measure the velocity of wave features to diagnose the wave types due to its close and rapid flybys. However, both by our own upper limits on wave motions and by analogy with previous measurements, we expect that the waves JunoCam detected near the equator are inertia-gravity waves.Plain Language Summary JunoCam, the visible camera on the Juno spacecraft orbiting Jupiter, has detected hundreds of small-scale waves and wave-like features, some as small as 30 km, shorter than ever measured before. Some waves appear near larger features, which may be associated with their origin, but others must be the result of winds hidden beneath the clouds. Most of the waves appear like long trains of narrow, parallel lines, but there is a wide variety of other types of wave-like features. Some waves converge on each other or cross over each other, and some wavefronts appear to radiate outward from a hurricane-like storm. Although waves are found over a wide range of latitudes from 20°S to 45°N, the overwhelming majority are found in a narrow band between 5°S and 5°N. The vast majority of these features are found at latitudes with strong prevailing eastward winds, heading in the same direction as Jupiter's rotation. The lack of motion associated with waves at the equator and their similarity to waves measured over even longer time spans by previous spacecraft imply that they are like ripples in a pond but in a rotating fluid, a phenomenon known as inertia-gravity waves.

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Section: Discussionsupporting

confidence: 63%

A Survey of Small-Scale Waves and Wave-Like Phenomena in Jupiter's Atmosphere Detected by JunoCam

Orton

Tabataba‐Vakili

Eichstädt

et al. 2020

Preprint

Self Cite

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“…11.11 appears to be the most prominent of the stratospheric layers). There have also been shadows observed in the north polar region (Ingersoll et al, 2018), but these seem to be more subtle for reasons that remain to be understood. Sromovsky et al (2021) also showed that slightly better fits of north polar cloud structure can be obtained in some cases with thicker sheet clouds in which the top pressures are 60% of the bottom pressures (vs. the 90% they used generally).…”

Section: Vertical Extent Of Aerosol Layersmentioning

confidence: 99%

Saturn's Seasonal Atmosphere at Northern Summer Solstice

Fletcher¹,

Sromovsky²,

Hue³

et al. 2020

Preprint

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The incredible longevity of Cassini's orbital mission at Saturn has provided the most comprehensive exploration of a seasonal giant planet to date. This review explores Saturn's changing global temperatures, composition, and aerosol properties between northern spring and summer solstice (2015-2017), extending our previous review of Cassini's remote sensing investigations (2004( -2014( , Fletcher et al., 2018c to the grand finale. The result is an unprecedented record of Saturn's climate that spans almost half a Saturnian year, which can be used to test the seasonal predictions of radiative climate models, neutral and ion photochemistry models, and atmospheric circulation models. Hemi-

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“…3). This spot is possibly the vortex labelled as "A1" in the high-resolution Cassini ISS images obtained during Cassini's Grand Finale (Figure 1 in Ingersoll et al 2018) and is the subpolar single vortex described by del . The vortex is also highlighted in the Cassini map in 2016 shown in Figure 2.…”

Section: Ribbon and Bright Features In 2018 (Ls=99-105)mentioning

confidence: 91%