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Nephelometer (NEP)

NSSDC ID: 1989-084E-05
Mission Name: Galileo Probe
Principal Investigator: Dr. Boris Ragent


The objective of this investigation is to determine vertical extent, structure, and microphysical characteristics (particle size distribution, number density, and physical structure) of Jupiter's clouds over the range 0.1 to 10 bars. A single-wavelength, multiple-angle (5) scattering nephelometer, with a gallium-arsenide LED (9000 A) source and solid-state detectors is mounted on the Probe, with appropriate external viewing geometry. Deployment takes place after the heat shield is removed. The total mass is 1.8 kg and the total continuous power is 3.0 W.

Alternate Names

  • NEP

Facts in Brief

Mass: 4.4 kg
Power (avg): 11.3 W
Bit rate (avg): 0.01 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. David S. ColburnCo-InvestigatorNASA Ames Research Center 
Mr. Philip AvrinCo-InvestigatorMartin-Marietta Aerospace 
Dr. Gerald W. GramsCo-InvestigatorGeorgia Institute of Technology 
Prof. Jacques E. BlamontCo-InvestigatorCNRS, Service d'Aeronomie 
Dr. James B. PollackCo-InvestigatorNASA Ames Research Center 
Dr. Boris RagentGeneral ContactNASA Ames Research Center 

Selected References

Ragent, B., et al., Galileo probe nephelometer experiment, Space Sci. Rev., 60, No. 1/4, 179-201, May 1992.

Ragent, B., et al., Results of the Galileo probe nephelometer experiment, Science, 272, No. 5263, 854-856, May 1996.

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