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Atmospheric Structure Instrument (ASI)

NSSDC ID: 1989-084E-02
Mission Name: Galileo Probe
Principal Investigator: Dr. Alvin Seiff


The objective of this investigation is to determine temperature, pressure, density, and molecular weight over an altitude range from a threshold of about 1000 km above the cloud deck down to Probe failure (deeper than 10-bar pressure). The instrument package consists of acceleration, temperature, and pressure sensors and associated electronics. The package is mounted in the Probe with the accelerometers near the Probe's center of gravity. The temperature-sensing head and pressure inlet are deployed outside the Probe boundary layer. The total mass is 1.9 kg and the total continuous power is 5.5 W.

Alternate Names

  • ASI

Facts in Brief

Mass: 0.54 kg
Power (avg): 3.8 W
Bit rate (avg): 0.018 bps


  • Planetary Science: Atmospheres

Additional Information

Questions or comments about this experiment can be directed to: Dr. Edwin V. Bell, II.



NameRoleOriginal AffiliationE-mail
Dr. Donn B. KirkCo-InvestigatorNASA Ames Research Center 
Mr. Tony C.D. KnightCo-InvestigatorMartin-Marietta Aerospace 
Dr. Richard E. YoungCo-InvestigatorNASA Ames Research
Mr. S. C. SommerCo-InvestigatorNASA Ames Research Center 
Dr. Gerald SchubertCo-InvestigatorUniversity of California, Los
Mr. Robert C. BlanchardCo-InvestigatorNASA Langley Research
Dr. Alvin SeiffGeneral ContactNASA Ames Research Center 
Mr. John D. MihalovCo-InvestigatorNASA Ames Research

Selected References

Pollack, J. B., et al., Retrieval of a wind profile from the Galileo probe telemetry signal, Space Sci. Rev., 60, No. 1/4, 143-178, May 1992.

Seiff, A., and T. C. D. Knight, The Galileo probe atmosphere structure instrument, Space Sci. Rev., 60, No. 1/4, 203-232, May 1992.

Seiff, A., et al., Structure of the atmosphere of Jupiter: Galileo probe measurements, Science, 272, No. 5263, 844-845, May 1996.

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