Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..390m&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
The upper clouds of Venus have been studied extensively from ground and space borne observations in the past, especially in the ultraviolet part of the spectrum. To date we know that the atmosphere of Venus is in a constant state of super-rotation, reaching speeds around 100 ms-1 at the cloud tops and that the cloud markings in the UV are caused by SO2 and another, yet unknown, UV absorber. This presentation deals with the results on the atmospheric dynamics at the cloud top region (≈ 65-70 km above the surface) of Venus, derived from manual and automated cloud tracking in the UV channel (lambda= 365 +- 10 nm) of the Venus Monitoring Camera Experiment (VMC) on board the Venus Express mission. With the VMC it became possible to investigate the global dynamics with a relatively high resolution in space and time on a long term basis. In addition to the confirmation of results from previous studies on the atmospheric dynamics, the observations of the southern hemisphere by the VMC allowed for detailed studies of the strong cloud-level super-rotation phenomenon on Venus and its variability on different timescales ranging from hours to several months. Information on the latitudinal wind speed profiles could be obtained for latitudes up to ≈85 degree S, extending the results from previous studies by almost 20 degree. Global wave modes which are believed to play a key role for understanding energy transport phenomena in the venusian atmosphere, such as a 4-day Kelvin wave mode in low latitudes and diurnal and semidiurnal solar thermal tides have been detected in the analysis cloud tracked wind fields of the southern hemisphere of Venus.
Khatuntsev Igor
Limaye Sanjay S.
Markiewicz Wojciech J.
Moissl Richard
Titov D. T.
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