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Eddy diffusion coefficient for the atmosphere of Venus from radio scintillation measurementsEstimates are obtained of the vertical mass eddy diffusion coefficient of the Venus atmosphere in the region of turbulence near 60 km on the basis of radio scintillations observed during radio occultation by the atmosphere. The structure constant estimated from Pioneer Venus orbit 18 entrance radio occultation measurements is used, under the assumption that the turbulence is generated by wind-shear, to derive a value of 40,000 sq cm/sec for the vertical mass eddy diffusion coefficient, together with an energy dissipation rate of 20 sq cm/sec and a temperature fluctuation dissipation rate of 0.001 K-squared/sec. Results are noted to fall within the range measured for the earth's troposphere, however, indicate that small-scale turbulence is probably the dominant mechanism for vertical transport near the tropopause in the Venus atmosphere.
Document ID
19810037941
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Woo, R.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Ishimaru, A.
(Washington, University Seattle, Wash., United States)
Date Acquired
August 11, 2013
Publication Date
January 29, 1981
Publication Information
Publication: Nature
Volume: 289
Subject Category
Lunar And Planetary Exploration
Accession Number
81A22345
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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