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  • 1
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    Titan's atmospheric temperatures, winds, and composition (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-05-17
    Description: Temperatures obtained from early Cassini infrared observations of Titan show a stratopause at an altitude of 310 kilometers (and 186 kelvin at 15 degrees S). Stratospheric temperatures are coldest in the winter northern hemisphere, with zonal winds reaching 160 meters per second. The concentrations of several stratospheric organic compounds are enhanced at mid- and high northern latitudes, and the strong zonal winds may inhibit mixing between these latitudes and the rest of Titan. Above the south pole, temperatures in the stratosphere are 4 to 5 kelvin cooler than at the equator. The stratospheric mole fractions of methane and carbon monoxide are (1.6 +/- 0.5) x 10(-2) and (4.5 +/- 1.5) x 10(-5), respectively.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flasar, F M -- Achterberg, R K -- Conrath, B J -- Gierasch, P J -- Kunde, V G -- Nixon, C A -- Bjoraker, G L -- Jennings, D E -- Romani, P N -- Simon-Miller, A A -- Bezard, B -- Coustenis, A -- Irwin, P G J -- Teanby, N A -- Brasunas, J -- Pearl, J C -- Segura, M E -- Carlson, R C -- Mamoutkine, A -- Schinder, P J -- Barucci, A -- Courtin, R -- Fouchet, T -- Gautier, D -- Lellouch, E -- Marten, A -- Prange, R -- Vinatier, S -- Strobel, D F -- Calcutt, S B -- Read, P L -- Taylor, F W -- Bowles, N -- Samuelson, R E -- Orton, G S -- Spilker, L J -- Owen, T C -- Spencer, J R -- Showalter, M R -- Ferrari, C -- Abbas, M M -- Raulin, F -- Edgington, S -- Ade, P -- Wishnow, E H -- New York, N.Y. -- Science. 2005 May 13;308(5724):975-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15894528" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon Monoxide ; Extraterrestrial Environment ; *Hydrocarbons ; *Methane ; *Nitriles ; *Saturn ; Spacecraft ; Temperature ; Wind
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Temperatures, winds, and composition in the saturnian system (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-12-25
    Description: Stratospheric temperatures on Saturn imply a strong decay of the equatorial winds with altitude. If the decrease in winds reported from recent Hubble Space Telescope images is not a temporal change, then the features tracked must have been at least 130 kilometers higher than in earlier studies. Saturn's south polar stratosphere is warmer than predicted from simple radiative models. The C/H ratio on Saturn is seven times solar, twice Jupiter's. Saturn's ring temperatures have radial variations down to the smallest scale resolved (100 kilometers). Diurnal surface temperature variations on Phoebe suggest a more porous regolith than on the jovian satellites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flasar, F M -- Achterberg, R K -- Conrath, B J -- Pearl, J C -- Bjoraker, G L -- Jennings, D E -- Romani, P N -- Simon-Miller, A A -- Kunde, V G -- Nixon, C A -- Bezard, B -- Orton, G S -- Spilker, L J -- Spencer, J R -- Irwin, P G J -- Teanby, N A -- Owen, T C -- Brasunas, J -- Segura, M E -- Carlson, R C -- Mamoutkine, A -- Gierasch, P J -- Schinder, P J -- Showalter, M R -- Ferrari, C -- Barucci, A -- Courtin, R -- Coustenis, A -- Fouchet, T -- Gautier, D -- Lellouch, E -- Marten, A -- Prange, R -- Strobel, D F -- Calcutt, S B -- Read, P L -- Taylor, F W -- Bowles, N -- Samuelson, R E -- Abbas, M M -- Raulin, F -- Ade, P -- Edgington, S -- Pilorz, S -- Wallis, B -- Wishnow, E H -- New York, N.Y. -- Science. 2005 Feb 25;307(5713):1247-51. Epub 2004 Dec 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Aeronautics and Space Administration (NASA)/Goddard Space Flight Center, Code 693, Greenbelt, MD 20771, USA. f.m.flasar@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15618486" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Carbon ; Extraterrestrial Environment ; Hydrogen ; Methane ; *Saturn ; Spacecraft ; Spectrum Analysis ; Temperature ; Wind
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Evidence for a polar ethane cloud on Titan (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-09-16
    Description: Spectra from Cassini's Visual and Infrared Mapping Spectrometer reveal the presence of a vast tropospheric cloud on Titan at latitudes 51 degrees to 68 degrees north and all longitudes observed (10 degrees to 190 degrees west). The derived characteristics indicate that this cloud is composed of ethane and forms as a result of stratospheric subsidence and the particularly cool conditions near the moon's north pole. Preferential condensation of ethane, perhaps as ice, at Titan's poles during the winters may partially explain the lack of liquid ethane oceans on Titan's surface at middle and lower latitudes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffith, C A -- Penteado, P -- Rannou, P -- Brown, R -- Boudon, V -- Baines, K H -- Clark, R -- Drossart, P -- Buratti, B -- Nicholson, P -- McKay, C P -- Coustenis, A -- Negrao, A -- Jaumann, R -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1620-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, 85721 USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973876" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Cold Temperature ; *Ethane ; Extraterrestrial Environment ; Gases ; Ice ; Methane ; Photochemistry ; *Saturn ; Spacecraft
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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