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- W2045143022 abstract "We report on direct wind measurements in Venus’ mesosphere (90–115 km), performed in support of Venus Express, and based on CO millimeter observations. Most observations, sampling the CO(2–1) and CO(1–0) lines, were acquired with the IRAM 30-m telescope, over four distinct periods: (i) Summer 2006; (ii) May–June 2007, in association with the coordinated ground-based campaign; (iii) August 2007 inferior conjunction and (iv) September 2007. In the latter period, additional measurements (CO(3–2)) were obtained with the APEX 12-m telescope. Overall, the measurements indicate a large body of temporal variability of the Venus mesospheric field, but general features emerge: (i) winds strongly increase with altitude within the mesosphere, by a factor of 2–3 over a decade in pressure; (ii) many, but not all, of our observations can be viewed as the superposition of zonal retrograde and subsolar-to-antisolar (SSAS) flows of comparable speeds, typically 30–50 m/s near 0.1 mbar (∼93km) and 90–120 m/s near 0.01 mbar (∼102km) (iii) the wind field was very stable over three consecutive observing days in May–June 2007, but much more variable on a similar time base in August 2007 (iv) at a ∼2000km resolution, the nightside wind field appears very complex, with evidence that the SSAS flow does not reach high latitudes, and possible evidence for additional meridional winds. Our Summer 2006 observations, which sample Venus’ dayside, seem to suggest that a prograde zonal flow is superimposed to the SSAS circulation for this period. This surprising result, which implies a pre-midnight convergence of the wind field, requires confirmation, and fruitful comparisons may be obtained from the analysis of motions in the O2 emission images, as observed by Venus Express." @default.
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- W2045143022 date "2008-08-01" @default.
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- W2045143022 title "Monitoring Venus’ mesospheric winds in support of Venus Express: IRAM 30-m and APEX observations" @default.
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- W2045143022 doi "https://doi.org/10.1016/j.pss.2008.06.010" @default.
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