Determination of Venus winds by ground-based radio tracking of the VEGA balloons

Details Determination of Venus winds by ground-based radio tracking of the VEGA balloons Determination of Venus winds by ground-based radio tracking of the VEGA balloons

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...231.1414p&link_type=abstract

Science (ISSN 0036-8075), vol. 231, March 21, 1986, p. 1414-1416. NASA-supported research.

Mathematics

Logic

31

Meteorological Balloons, Planetary Meteorology, Vega Project, Venus Atmosphere, Wind Velocity Measurement, Atmospheric Circulation, Equatorial Atmosphere, Ground Truth, Radial Velocity, Radio Tracking, Venus, Vega 1, Vega 2, Probes, Experiments, Atmosphere, Meteorology, Mission Description, Earth-Based Observations, Procedure, Techniques, Velocity, Wind, Motion, Analysis, Models

Scientific paper

A global array of 20 radio observatories was used to measure the three-dimensional position and velocity of the two meteorological balloons that were injected into the equatorial region of the Venus atmosphere near Venus midnight by the VEGA spacecraft on June 11 and 15, 1985. Initial analysis of only radial velocities indicates that each balloon was blown westward about 11,500 kilometers (8,000 kilometers on the night side) by zonal winds with a mean speed of about 70 meters per second. Excursions of the data from a model of constant zonal velocity were generally less than 3 meters per second; however, a much larger variation was evident near the end of the flight of the second balloon. Consistent systematic trends in the residuals for both balloons indicate the possibility of a solar-fixed atmospheric feature. Rapid variations in balloon velocity were often detected within a single transmission (330 seconds); however, they may represent not only atmospheric motions but also self-induced aerodynamic motions of the balloon.

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