Cited by 16Astro and Planetary ScienceIonosphere and magnetosphere dynamicsStellar, planetary, and galactic studies

Saturn's global zonal winds explored by Cassini/VIMS 5-μm images

Studwell, Aaron, Li, Liming, Jiang, Xun, Baines, Kevin H., Fry, Patrick M., Momary, Thomas W., Dyudina, Ulyana A.·2018·Geophysical Research Letters

Abstract

The Cassini Visual and Infrared Mapping Spectrometer (VIMS) 5‐μm images are used to derive Saturn's global zonal winds around the 2,000‐hPa level. The comparison of zonal winds between 2,000 and 300–500 hPa shows a general consistency of wind structure between the two pressure levels on a global scale. However at some latitudes, the magnitude of the zonal winds differs between these levels. The equatorial zonal winds are stronger downward, while the zonal winds in the middle and high latitudes are generally weaker downward. These new wind measurements also imply that barotropic and baroclinic instabilities probably exist through the relatively deep atmosphere at some latitudes. Finally, our analysis reveals that the VIMS winds in the two polar regions are basically constant with time except for a westerly jet centered at ~88°N, which decreased from 135 ± 7 m/s in 2008 to 91 ± 12 m/s in 2017.

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Crossref · 10.1029/2018gl078139

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  • Zonal winds obtained in Cassini VIMS images sensitive to the ∼2 bar level are closer to the speed of the bright white spot than winds in the upper layers measured in Cassini ISS images.

    “Zonal winds obtained in Cassini VIMS images sensitive to the ∼ 2 bar level (Choi et al., 2009; Studwell et al., 2018) are closer to the speed of the bright white spot than winds in the upper layers measured in Cassini ISS images.”

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Authors
Studwell, A., Li, L., Jiang, X., Baines, K. H., Fry, P. M., Momary, T. W., & Dyudina, U. A.
Affiliations
  • University of Houston (US)
  • Jet Propulsion Laboratory (US)
  • University of Wisconsin–Madison (US)
  • Space Science Institute (US)
Corresponding author
Li, Liming
Venue
Geophysical Research Letters
Published
2018-07-25
Volume
45
Issue
14
Pages
6823-6831
ISSN
  • 0094-8276 (ISSN-L)
  • 1944-8007
OpenAlex
W2851910833
Cited by
16
References
60
Citations by year
2026: 2 · 2025: 2 · 2023: 1 · 2022: 2 · 2020: 6 · 2019: 3
FWCI
1.21
Type
journal article
Language
en
Open access
closed
Locations
Geophysical Research Letters (publishedVersion)
Funders
NASA ROSES CDAP and PDART
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Ionosphere and magnetosphere dynamics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
Keywords
Saturn, zonal wind, Cassini VIMS, atmospheric dynamics, baroclinic instability, barotropic instability, polar jet, equatorial winds

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