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Variable winds on Venus mapped in three dimensions

A. Sánchez-Lavega, R. Hueso, G. Piccioni, P. Drossart, J. Peralta, S. Pérez-Hoyos, C. F. Wilson, F. W. Taylor, K. H. Baines, D. Luz, S. Erard, S. Lebonnois

Abstract
We present zonal and meridional wind measurements at three altitude levels within the cloud layers of Venus from cloud tracking using images taken with the VIRTIS instrument on board Venus Express. At low latitudes, zonal winds in the Southern hemisphere are nearly constant with latitude with westward velocities of 105 ms-1 at cloud-tops(altitude ~ 66 km) and 60-70 ms-1 at the cloud-base(altitude ~ 47 km). At high latitudes, zonal wind speeds decrease linearly with latitude with no detectable vertical wind shear(values lower than 15 ms-1),indicating the possibility of a vertically coherent vortex structure. Meridional winds at the cloud-tops are poleward with peak speed of 10 ms-1 at 55° S but below the cloud tops and averaged over the South hemisphere are found to be smaller than 5 ms-1. We also report the detection at subpolar latitudes of wind variability due to the solar tide.

Keywords
Atmospheric: Composition: and: Structure - Planetary: atmospheres:(5210, 5405, 5704) - Planetary: Sciences - Solar: System: Objects - Venus - Atmospheric: Processes - General: circulation(1223) - Atmospheric: Processes - Planetary: meteorology:(5445, 573

Geophysical Research Letters
Volume 35, Number 13, Page L1320_1
2008 July

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia