Author/Authors :
Dyudina، نويسنده , , Ulyana A. and Ingersoll، نويسنده , , Andrew P. and Ewald، نويسنده , , Shawn P. and Vasavada، نويسنده , , Ashwin R. and West، نويسنده , , Robert A. and Baines، نويسنده , , Kevin H. and Momary، نويسنده , , Thomas W. and Del Genio، نويسنده , , Anthony D. and Barbara، نويسنده , , John M. and Porco، نويسنده , , Carolyn C. and Achterberg، نويسنده , , Richard K. and Flasar، نويسنده , , F. Michael and Simon-Miller، نويسنده , , Amy A. and Fletcher، نويسنده , , Leigh N.، نويسنده ,
Abstract :
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 Saturnʹs 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 m s − 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.
Keywords :
Atmospheresdynamics , Saturnatmosphere , Meteorology , Spectroscopy , Infrared observations
