Journal
SCIENCE
Volume 332, Issue 6029, Pages 577-580Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1201629
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Funding
- Fundacao para a Ciencia e a Tecnologia [PTDC/CTE-AST/110702/2009]
- UK's Science and Technology Facilities Council
- European Space Agency (ESA)
- Agenzia Spaziale Italiana
- Centre National d'Etudes Spatiales
- VIRTIS/VEX technical team
- Fundação para a Ciência e a Tecnologia [PTDC/CTE-AST/110702/2009] Funding Source: FCT
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Initial images of Venus's south pole by the Venus Express mission have shown the presence of a bright, highly variable vortex, similar to that at the planet's north pole. Using high-resolution infrared measurements of polar winds from the Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument, we show the vortex to have a constantly varying internal structure, with a center of rotation displaced from the geographic south pole by similar to 3 degrees of latitude and that drifts around the pole with a period of 5 to 10 Earth days. This is indicative of a nonsymmetric and varying precession of the polar atmospheric circulation with respect to the planetary axis.
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