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South-polar features on Venus similar to those near the north pole

Piccioni, G. and Drossart, P. and Sanchez-Lavega, A. and Hueso, R. and Taylor, F.W. and Grassi, D. and Zasova, L. and Moriconi, M. and Adriani, A. and Lebonnois, S. and Coradini, A. and Bezard, B. and Angrilli, F. and Arnold, G. and Baines, K.H. and Bellucci, G. and Benkhoff, J. and Bibring, J.P. and Blanco, A. and Blecka, M. I. and Carlson, R. W. and Di Lellis, A. and Encrenaz, T. and Erard, S. and Fonti, S. and Formisano, V. and Fouchet, T. and Garcia, R. and Haus, R. and Helbert, J. and Ignatiev, N. I. and Irwin, P.G.J. and Langevin, Y. and Lopez-Valverde, M.A. and Luz, D. and Marinangeli, L. and Orofino, V. and Rodin, A.V. and Roos-Serote, M.C. and Saggin, B. and Stam, D.M. and Titov, D. and Visconti, G. and Zambelli, M. and et.al., (2007) South-polar features on Venus similar to those near the north pole. Nature (450), pp. 637-640. DOI: 10.1038/nature06209.

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Venus has no seasons, slow rotation and a very massive atmosphere, which is mainly carbon dioxide with clouds primarily of sulphuric acid droplets. Infrared observations by previous missions to Venus revealed a bright 'dipole' feature surrounded by a cold 'collar' at its north pole1, 2, 3, 4. The polar dipole is a 'double-eye' feature at the centre of a vast vortex that rotates around the pole, and is possibly associated with rapid downwelling. The polar cold collar is a wide, shallow river of cold air that circulates around the polar vortex. One outstanding question has been whether the global circulation was symmetric, such that a dipole feature existed at the south pole. Here we report observations of Venus' south-polar region, where we have seen clouds with morphology much like those around the north pole, but rotating somewhat faster than the northern dipole. The vortex may extend down to the lower cloud layers that lie at about 50 km height and perhaps deeper. The spectroscopic properties of the clouds around the south pole are compatible with a sulphuric acid composition.

Document Type:Article
Title:South-polar features on Venus similar to those near the north pole
AuthorsInstitution or Email of Authors
Piccioni, G.INAF-IASF
Drossart, P.LESIA
Sanchez-Lavega, A.Universidad del Pais Vasco Alda
Hueso, R.Universidad del Pais Vasco Alda
Taylor, F.W.University of Oxford
Grassi, D.LESIA
Zasova, L.IKI
Moriconi, M.CNR-ISAC
Adriani, A.INAF-IFSI
Lebonnois, S.Laboratoire de Meteorologie Dynamique
Coradini, A.INAF-IFSI
Bezard, B.LESIA
Angrilli, F.CISAS
Baines, K.H.Jet Propulsion Lboratory
Bellucci, G.INAF-IFSI
Bibring, J.P.Universite Paris-Sud
Blanco, A.Universita degli Studi di Lecce
Blecka, M. I.Space Research Centre of Polish Academy of Science
Carlson, R. W.Jet Propulsion Laboratory
Di Lellis, A.AMDLSPACE s.r.l.
Encrenaz, T.LESIA
Erard, S.LESIA
Fonti, S.Universita degli Studi di Lecce
Formisano, V.INAF-IFSI
Fouchet, T.LESIA
Garcia, R.Institute de Physique du Globe de Paris
Ignatiev, N. I.IKI
Irwin, P.G.J.University of Oxford
Langevin, Y.Institut d`Astrophysique Spatiale
Lopez-Valverde, M.A.CSIC
Luz, D.Observatorio Astronomico de Lisboa
Marinangeli, L.Universita d`Annunzio
Orofino, V.Universita degli Studi di Lecce
Rodin, A.V.IKI
Roos-Serote, M.C.Observatorio Astronomico de Lisboa
Saggin, B.Politecnico di Milano
Stam, D.M.University of Amsterdam
Titov, D.Max-Planck-Inst. for Aeronomy
Visconti, G.Universita de L'Aquila
Zambelli, M.INAF-IASF
Journal or Publication Title:Nature
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 637-640
Macmilan Publisher Ltd., UNSPECIFIED
Series Name:Letter of Nature
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Remote Sensing Technology Institute > Marine Remote Sensing
Deposited By: Bärbel Bolowski
Deposited On:13 Dec 2007
Last Modified:15 Jan 2010 01:59

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