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Saturn's south polar vortex compared to other large vortices in the solar system

Dyudina, Ulyana A. and Ingersoll, Andrew P. and Ewald, Shawn P. and Vasavada, Ashwin R. and West, Robert A. and Baines, Kevin H. and Momary, Thomas W. and Del Genio, Anthony D. and Barbara, John M. and Porco, Carolyn C. and Achterberg, Richard K. and Flasar, E. Michael and Simon-Miller, Amy A. and Fletcher, Leigh N. (2009) Saturn's south polar vortex compared to other large vortices in the solar system. Icarus, 202 (1). pp. 240-248. ISSN 0019-1035.

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Observations made by the Imaging Science Subsystem (ISS), Visible and Infrared Mapping Spectrometer (VIMS) and the long-wavelength Composite Infrared Spectrometer (CIRS) aboard the Cassini spacecraft reveal that the large, long-lived cyclonic vortex at Saturn's south pole has a 4200-km-diameter cloud-free nearly circular region. This region has a 4 K warm core extending from the troposphere into the stratosphere, concentric cloud walls extending 20–70 km above the internal clouds, and numerous external clouds whose anticyclonic vorticity suggests a convective origin. The rotation speeds of the vortex reach 150 ± 20 ms^-1 . The Saturn polar vortex has features in common with terrestrial hurricanes and with the Venus polar vortex. Neptune and other giant planets may also have strong polar vortices.

Item Type:Article
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Ingersoll, Andrew P.0000-0002-2035-9198
Vasavada, Ashwin R.0000-0003-2665-286X
Additional Information:© 2009 Elsevier B.V. Received 19 September 2008; revised 9 February 2009; accepted 15 February 2009. Available online 26 February 2009. This research was supported by the NASA Cassini Project.
Funding AgencyGrant Number
Subject Keywords:Saturn, atmosphere; Atmospheres, dynamics; Infrared observations; Meteorology; Spectroscopy
Issue or Number:1
Record Number:CaltechAUTHORS:20090804-165518718
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14801
Deposited By: Jason Perez
Deposited On:06 Aug 2009 21:55
Last Modified:03 Oct 2019 00:52

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