Report

Earth-Based Radio Tracking of the Galileo Probe for Jupiter Wind Estimation

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Science  31 Jan 1997:
Vol. 275, Issue 5300, pp. 644-646
DOI: 10.1126/science.275.5300.644

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Abstract

Although the Galileo probe was designed to communicate only to the orbiter, the probe radio signal was detected at two Earth-based radio observatories where the signal was a billion times weaker. The measured signal frequency was used to derive a vertical profile of the jovian zonal wind speed. Due to the mission geometry, the Earth-based wind estimates are less sensitive to descent trajectory errors than estimates based on probe-orbiter Doppler measurements. The two estimates of wind profiles agree qualitatively; both show high wind speeds at all depths sampled.

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