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Article Dans Une Revue Science Année : 2011

Venus's Southern Polar Vortex Reveals Precessing Circulation

Résumé

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 ~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.

Dates et versions

hal-03785886 , version 1 (23-09-2022)

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David Luz, D. L. Berry, Giuseppe Piccioni, Pierre Drossart, Romolo Politi, et al.. Venus's Southern Polar Vortex Reveals Precessing Circulation. Science, 2011, 332, pp.577-. ⟨10.1126/science.1201629⟩. ⟨hal-03785886⟩
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