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.
|Title:||South-polar features on Venus similar to those near the north pole|
|Journal or Publication Title:||Nature|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 637-640|
|Series Name:||Letter of Nature|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|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)|
|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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