Please use this identifier to cite or link to this item:

Title: Velocities of Venus clouds derived from VIRTIS observations
Authors: Luz, David
Berry, David L.
Piccioni, Giuseppe
Drossart, Pierre
Keywords: Venus
Planetary atmospheres
Venus Express
Issue Date: 2008
Publisher: European Geophysical Union
Citation: Luz, D., Berry, D.L., Piccioni, G., Drossart, P. and the Venus Express Team. Velocities of Venus clouds derived from VIRTIS observations. Geophysical Research Abstracts, 10, EGU2008-A-02620, 2008.
Abstract: Retrograde superrotation is a well known feature of the atmosphere of Venus, with Venus’ cloud tops rotating in only 4.4 days, much faster than the 243-day rotation period of the solid globe. A good characterization of the circulation of the venusian atmosphere is essential in order to understand the mechanisms controlling superrota- tion. VIRTIS, onboard ESA’s Venus Express, is one of the most flexible instruments for such a characterization. The VIRTIS-M imaging spectrometer, operating in the range 0.25 to 5 micrometers, has acquired images of Venus’ clouds from the cloud tops, in visible wavelengths, to the lower cloud layer, close to 40 km, at infrared wavelengths. We present velocity determinations from automated cloud tracking in the night side at 1.74, 2.3 and 5 micrometers, from high to mid latitudes in the south- ern hemisphere. The method is based on a digital correlator which compares two or more consecutive images and identifies patterns by maximizing correlations between image blocks (Luz, Berry and Roos-Serote, 2008, New Ast. 13, 224). Notable features are the variability of the winds and the detection of a clear transition region between 75S and 80S. The meridional component is suggestive of a polar Hadley cell. Wave motions are detected at the transition latitudes with wavenumbers 3 and 8 for the zonal and meridional components. We estimate the contribution from the subsolar to antisolar-point wind component to be higher than 10 m/s.
Type: lecture
Appears in Collections:FIS - Comunicações - Em Congressos Científicos Internacionais

Files in This Item:

File Description SizeFormat
LuzEtAl2008.pdf7.32 kBAdobe PDFView/Open
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Dspace Dspace
DSpace Software, version 1.6.2 Copyright © 2002-2008 MIT and Hewlett-Packard - Feedback
UEvora B-On Curriculum DeGois