Further Results of the Pioneer Venus Nephelometer Experiment

@article{Blamont1979FurtherRO,
  title={Further Results of the Pioneer Venus Nephelometer Experiment},
  author={Jacques Blamont and Boris Ragent},
  journal={Science},
  year={1979},
  volume={205},
  pages={67 - 70}
}
Backscattering data for the nephelometer experiments conducted aboard the Pioneer Venus mission probes, including data up to the highest altitudes measured by the probes, are presented. A few small signals were detected below the main cloud deck. Ambient radiation was measured at near-ultraviolet and visible wavelengths; the variation of extinction of near-ultraviolet with altitude is inferred. Ambient radiance decreased more rapidly at 530 than at 745 nanometers in the lower atmosphere. 
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References

SHOWING 1-8 OF 8 REFERENCES

Preliminary Results of the Pioneer Venus Nephelometer Experiment

TLDR
Tentative results from attempting to use the data from the nephelometer and cloud particle size spectrometer on the sounder probe to identify the indices of refraction of cloud particles in various regions of the Venus clouds are reported.

Nature of the Ultraviolet Absorber in the Venus Clouds: Inferences Based on Pioneer Venus Data

Several photometric measurements of Venus made from the Pioneer Venus orbiter and probes indicate that solar near-ultraviolet radiation is being absorbed throughout much of the main cloud region, but

Thermal Contrast in the Atmosphere of Venus: Initial Appraisal from Pioneer Venus Probe Data

TLDR
The altitude profiles of temperature and pressure measured during the descent of the four Pioneer Venus probes show small contrast below the clouds but significant differences within the clouds at altitudes from 45 to 61 kilometers, consistent with cyclostrophic balance of zonal winds.

The Pioneer Venus Program

The Pioneer Venus program encompasses two spacecraft missions, Orbiter and Multiprobe, to be launched and to encounter Venus during the 1978 Venus mission opportunity. The missions are described in

Clouds of Venus: Particle Size Distribution Measurements

TLDR
The discovery of large particles > 30 micrometers, significant particle mass loading, and size spectral features suggest that precipitation is likely produced; a peculiar aerosol structure beneath the lowest cloud layer could be residue from a recent shower.

Clouds of Venus: A Preliminary Assessment of Microstructure

TLDR
Sedimentation and decomposition of H2SO4 in the droplets of the lower cloud region contribute more than 7 watts per square meter of heat flux equaling one-fourth of the solar net flux at 50 kilometers.

Altitude profil6s used in this report were obtained from A. Seiff [see

    Informatics, Inc., for support in data processing and instrument calibration

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