During their flight through the Venus atmosphere
the Vega 1 and Vega 2 balloon craft measured
the pressure and temperature of the ambient
medium, the vertical wind-velocity component (relative
to the gondola), the cloud-layer backscatter
coefficient, the mean illumination level, and the number
and time of possible lightning flashes. In addition, the ground radio telescope network measured
the balloon positions and drift velocities by the differential
VLBI technique; these data are now being
processed
