Venus Cloud Tracked Winds From Vex-virtis and Galileo-SSI: A Comparison.

Details Venus Cloud Tracked Winds From Vex-virtis and Galileo-SSI: A Comparison. Venus Cloud Tracked Winds From Vex-virtis and Galileo-SSI: A Comparison.

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.6104p&link_type=abstract

American Astronomical Society, DPS meeting #39, #61.04; Bulletin of the American Astronomical Society, Vol. 39, p.539

Astronomy and Astrophysics

Astronomy

Scientific paper

We have determined wind profiles on Venus at different cloud levels using images taken by the VIRTIS-M imaging spectrometer onboard Venus Express (April to July 2006), and by the SSI camera onboard Galileo spacecraft (February 1990). For the VIRTIS dataset the cloud tracking covers the latitude range from 5°S to 90°S and was obtained on images at wavelengths of 380 and 980 nm. These are compared with measurements at similar wavelengths over images captured by the Galileo spacecraft in 1990 and covering the latitude range from 70°S to 70°N. Concerning these wind profiles we highlight the following: (1) There is a strong decrease in the magnitude of the zonal winds poleward of latitudes 45°N and 50°S (Galileo) and 65°S (VEX), not strictly symmetric with respect of the equator; (2) At the equator and mid-latitudes the wind speed is nearly constant with values depending on the wavelength range and, as a result, on the cloud height; (3) Wind decreases to almost 0 m s-1 at the South Pole (VEX); (4) There is a strong variability in the latitude band 55°N to 65°N (Galileo) and 65°S to 75°S (Galileo and VEX). These results are compared with those obtained by Pioneer Venus mission and previous analyses with Galileo data. A profile obtained with VIRTIS images at wavelengths 1.74 and 2.3 microns from Venus thermal night-time emission is also presented.

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