Composition and Structure of the Venus Atmosphere: Results from Pioneer Venus

  title={Composition and Structure of the Venus Atmosphere: Results from Pioneer Venus},
  author={John H. Hoffman and R. Richard Hodges and Michael B. McElroy and Thomas M. Donahue and Marc A. Kolpin},
  pages={49 - 52}
Results from the Pioneer Venus sounder probe neutral mass spectrometer indicate that there is no difference in the isotopic ratios of carbon and oxygen between Venus and Earth to within � 5 percent. The mixing ratio of nitrogen is 3.5+3-2 percent with an isotopic ratio within 20 percent of that of Earth. The ratio of argon-36 to argon-40 is 85 percent, and the ratio of argon-38 to argon-36 is 20 percent. The mixing ratios of argon-36 and argon-40 are approximately 40 and 50 parts per million… 
Composition of the Venus lower atmosphere from the Pioneer Venus Mass Spectrometer
Data from the Pioneer Venus sounder probe neutral mass spectrometer confirm that the major constituents of the lower atmosphere of Venus are CO2 and N2, with the latter having a mass abundance of
Measurements of the Venus lower atmosphere composition: A comparison of results
From the Pioneer Venus, as well as the Venera 11 and 12 spacecrafts, data on the chemical composition of the Venus atmosphere from about 700 km to the surface were obtained. In general, reasonable
Past and present water budget of Venus
A detailed analysis of Pioneer Venus large-probe neutral mass spectrometer (LNMS) data confirms an earlier report that the abundance of Venus deuterium relative to hydrogen is 2 orders of magnitude
Krypton and xenon in the atmosphere of Venus
Probable values of the mixing ratios of krypton and its isotopes on Venus by the Pioneer Venus large probe neutral mass spectrometer are reported. An upper limit to most of the xenon isotope mixing
Global empirical model of the Venus thermosphere
Direct measurements of neutral CO2, O, CO, N2, He, and N densities from the Pioneer Venus Orbiter Neutral Mass Spectrometer are described in terms of a spherical harmonic representation (latitude and
On December 9, 1978, the Pioneer Venus Sounder Probe carried to Venusa neutral gas mass spectrometer that measured the composition of the loweratmosphere of the planet from 62 km to the surface.
Isotopic Composition of Solar Wind Nitrogen: First In Situ Determination with the CELIAS/MTOF Spectrometer on board SOHO
Using the high-resolution Mass Time-of-Flight (MTOF) spectrometer of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO), we


Venus Lower Atmospheric Composition: Preliminary Results from Pioneer Venus
Initial examination of data from the neutral mass spectrometer on the Pioneer Venus sounder probe indicates that the abundances of argon-36, argon-38, and neon-20 in the Venus atmosphere are much
The composition of the atmosphere at the surface of Mars
We have confirmed the discovery of N2 and 40Ar by the Entry Science Team, and we have also detected Ne, Kr, Xe, and the primordial isotopes of Ar. The noble gases exhibit an abundance pattern similar
Preliminary Results of the Pioneer Venus Nephelometer Experiment
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.
Clouds of Venus: Particle Size Distribution Measurements
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.
Venus Lower Atmospheric Composition: Analysis by Gas Chromatography
A comparison of the inventory of inert gases found in the atmospheres of Venus, Earth, and Mars suggests that these components are due to outgassing from the planetary interiors.
Klimond vitskiy
  • Astron. Zh
  • 1979
Work at the University of Texas at Dallas was M. KOLPIN supported by NASA contracts NAS2-8802 and NAS2-9485
  • 1973
Poll. MCELROY lack
  • Science
  • 1979