Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1045t&link_type=abstract
(NASA, State University of New York, AAS, and AGU, Conference on the Atmosphere of Venus, NASA Goddard Institute for Space Studi
Astronomy and Astrophysics
Astronomy
9
Astronomical Spectroscopy, Atmospheric Circulation, Doppler Effect, Line Spectra, Venus Atmosphere, Wind Measurement, Fraunhofer Lines, Interferometry, Meridional Flow, Ultraviolet Spectra, Wind Velocity
Scientific paper
Measurements of the differential Doppler shift between various points on Venus using a high-resolution PEPSIOS interferometer. Using both a CO2 line and a Fraunhofer line a mean zonal-wind velocity of about -83 m/s is found near the equator; the velocity appears to vary from about -2 to -125 m/s with a time scale of greater than one week. Meridional velocities are measured to be weak. The equatorial zonal velocity appears to be smaller in the 'morning' than in the 'afternoon'. A comparison with reported velocities of the ultraviolet dark markings reveals general agreement in that both find the motion to be retrograde, variable, and accelerated during the day. A new potential source of systematic error in all spectroscopic determinations of the differential Doppler shift of nonuniformly illuminated objects is pointed out.
Carleton Nathaniel P.
Traub Wesley A.
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