Semi-annual oscillations in Saturn’s low-latitude stratospheric temperatures

Glenn S. Orton (), Padma A. Yanamandra-Fisher, Brendan M. Fisher, A. James Friedson, Paul D. Parrish, Jesse F. Nelson, Amber Swenson Bauermeister, Leigh Fletcher, Daniel Y. Gezari, Frank Varosi, Alan T. Tokunaga, John Caldwell, Kevin H. Baines, Joseph L. Hora, Michael E. Ressler, Takuya Fujiyoshi, Tetsuharu Fuse, Hagop Hagopian, Terry Z. Martin, Jay T. Bergstralh, Carly Howett, William F. Hoffmann, Lynne K. Deutsch, Jeffrey E. Van Cleve, Eldar Noe, Joseph D. Adams, Marc Kassis and Eric Tollestrup
Additional contact information
Glenn S. Orton: MS 169-237,
Padma A. Yanamandra-Fisher: MS 169-237,
Brendan M. Fisher: MS 183-601, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
A. James Friedson: MS 169-237,
Paul D. Parrish: School of Geosciences, University of Edinburgh, Crew Building, The King's Buildings, West Mains Road, Edinburgh EH9 3JN, UK
Jesse F. Nelson: University of Maine, 5709 Bennett Hall, Orono, Maine 04469, USA
Amber Swenson Bauermeister: 601 Campbell Hall, University of California, Berkeley, California 94720-3411, USA
Leigh Fletcher: MS 169-237,
Daniel Y. Gezari: Code 667, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
Frank Varosi: University of Florida, 211 Bryant Space Science Center, PO Box 112055, Gainesville, Florida 32611-2055, USA
Alan T. Tokunaga: Institute for Astronomy, University of Hawaii, 2880 Woodlawn Drive, Honolulu, Hawaii 96822, USA
John Caldwell: York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada
Kevin H. Baines: MS 183-601, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Joseph L. Hora: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
Michael E. Ressler: MS 79-5, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Takuya Fujiyoshi: Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, Hawaii 96720, USA
Tetsuharu Fuse: Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, Hawaii 96720, USA
Hagop Hagopian: 4732 Boelter Hall, University of California, Los Angeles, California 90095, USA
Terry Z. Martin: MS 169-237,
Jay T. Bergstralh: Langley Research Center, Hampton, Virginia 23681-2199, USA
Carly Howett: Atmospheric, Oceanic and Planetary Physics, Clarendon Laboratory, Oxford University, Parks Road, Oxford, Oxfordshire OX1 3PU, UK
William F. Hoffmann: Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA
Jeffrey E. Van Cleve: Ball Aerospace & Technologies Corp., Civil Space Systems, PO Box 1062, Boulder, Colorado 80306, USA
Eldar Noe: MS 183-501, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Joseph D. Adams: 206 Space Sciences Building, Ithaca, New York 14583, USA
Marc Kassis: W. M. Keck Observatory, 62-1120 Mamalahoa Highway, Kamuela, Hawaii 96743, USA
Eric Tollestrup: NASA Infrared Telescope Facility, Institute for Astronomy, 640 North A’ohoku Place, Hilo, Hawaii 96822, USA

Nature, 2008, vol. 453, issue 7192, 196-199

Abstract: Seasonality on Saturn Both Earth and Jupiter have equatorial oscillations in their atmospheres, with two-year and four-year periodicity respectively. Two groups working independently now report a related phenomenon on Saturn. Orton et al. analysed wo decades of ground-based observations of Saturn's stratospheric emissions to reveal an oscillation with a period of 14.8±1.2 terrestrial years. This is roughly half of Saturn's year, suggesting seasonal forcing, as is the case with the Earth's semiannual oscillation. Fouchet et al. used infrared spectrometry data from the Cassini probe to detect a similar equatorial oscillation.

Date: 2008
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DOI: 10.1038/nature06897

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