Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..671m&link_type=abstract
Geophysical Research Letters, vol. 6, Aug. 1979, p. 671-674. Bundesministerium für Forschung und Technologie
Astronomy and Astrophysics
Astronomy
2
Abundance, Argon Isotopes, Planetary Composition, Thermosphere, Venus Atmosphere, Gas Density, Gas Temperature, Mass Spectrometers, Neutral Gases, Pioneer Venus Spacecraft, Spaceborne Astronomy
Scientific paper
On December 9, 1978 the neutral gas mass spectrometer aboard the NASA Pioneer Venus multiprobe bus has measured density, composition, and temperature of the Venus dayside thermosphere. There was no positive identification of argon down to the lowest measuring altitude of 130 km. For the altitude level of 135 km the following upper limits for the number densities of argon isotopes were derived: n(Ar-36) less than 1.3 times 10 to the 6th power per cu cm and n(Ar-40) less than 2.8 times 10 to the 6th power per cu cm. From our upper atmosphere observations we infer for the troposphere of Venus the following upper limits for the mixing ratios: n(Ar-36)/total number density less than 9 times 10 to the minus 6th power and n(Ar-40)/total number density less than 20 times 10 to the minus 6th power.
Krankowsky Dieter
Mauersberger Konrad
von Zahn Ulf
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