The Galileo Probe Atmosphere Structure Instrument

Physics

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Atmospheric Temperature, Cloud Physics, Galileo Probe, Jupiter Atmosphere, Satellite-Borne Instruments, Temperature Measurement, Atmospheric Turbulence, Descent Trajectories, Gravity Waves, Pressure Distribution

Scientific paper

The Galileo Probe Atmosphere Structure Instrument will make in situ measurements of the temperature and pressure profiles of the atmosphere of Jupiter starting at about 10 exp -10 bar level, when the Probe enters the upper atmosphere at a velocity of 48 km/s, and continuing through its parachute descent to the 16 bar level. The data should make possible a number of inferences relative to atmospheric and cloud physical processes, cloud location and internal state, and dynamics of the atmosphere. For example, atmospheric stability should be defined, from which the convective or stratified nature of the atmosphere at levels surveyed should be determined and characterized, as well as the presence of turbulence and/or gravity waves. The temperature sensors are similar to those used on Pioneer Venus; pressure sensors are similar to those used in the Atmosphere Structure Experiment during descent of the Viking Landers (and by the Meteorology Experiment after landing on the surface); the accelerometers are a miniaturized version of the Viking accelerometers. The microprocessor controlled experiment electronics serve multiple functions, including the sequencing of experiment operation in three modes and performing some on-board data processing and data compression.

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