Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..387s&link_type=abstract
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 387, 1992
Astronomy and Astrophysics
Astrophysics
10
Planetology, Venus Atmosphere, Vlbi
Scientific paper
Results are reported of the measurement of balloon motion in the upper layers of the Venus atmosphere. The measurement of the balloon trajectories was carried out by differential very-long-baseline interferometry (VLBI) observations of the balloons relative to the fly-by spacecrafts (VEGA-1 and VEGA-2). Balloon-2, launched in the southern hemisphere of the planet led to the discovery of gas motion with average velocities of 65.3 m s-1 and 3.4 m s-1 in longitude and latitude. respectively. Balloon-1, launched in the northern hemisphere, showed that gas motions occur with an average velocity of 68.7 m s-1 in the longitudinal direction, but no wind was detected in the latitudinal direction. Pendulum motion of the balloon baskets with a period of 7.4s was detected on many occasions. This occurred 10 times more frequently in the southern hemisphere than in the northern one. The nature of these phenomena is discussed.
Biraud Francois
Blamont E. J. E. J.
Boischot Andre
Boloh L.
Cohen Morrel H.
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