Venus: Preliminary Topographic and Surface Imaging Results from the Pioneer Orbiter

  title={Venus: Preliminary Topographic and Surface Imaging Results from the Pioneer Orbiter},
  author={Gordon H. Pettengill and Peter G. Ford and Walter E. Brown and William M. Kaula and Harold Masursky and Eric M. Eliason and George E. Mcgill},
  pages={90 - 93}
Three large Venus surface features, identified previously in images obtained from Earth-based radar observations, are shown by the Pioneer Venus radar mapper to be elevated 5 to 10 kilometers above the surrounding terrain. Two of these features, one bright and the other dark, lie adjacent to each other astride the 65�N parallel between longitudes 310�E and 10�E. The combined region forms a huge tectonically uplifted plateau, surmounted by radar-bright ridges that may have either a volcanic or… 
Pioneer Venus Radar results: Geology from images and altimetry
Altimetry and radar image data obtained by the Pioneer Venus spacecraft and earth-based radars have provided a first look at the global distribution of topographic relief, regional morphology, and
Geology of the Venus equatorial region from Pioneer Venus radar imaging
Pioneer Venus radar data has provided images (resolution 20- to 40-km) of approximately 50% of the total surface of Venus in a band between 45 ° N to 15 ° S. These data are used to map the broad
Pioneer Venus Orbiter Radar Mapper: Design And Operation
The Radar Mapper Experiment, carried abroad the Pioneer Venus Orbiter spacecraft, is designed to obtain a near-global picture of the topography, meter-scale surface slopes and reflectivity of Venus.
Volcanism in Northwest lshtar Terra, Venus
Soviet Venera 15/16 radar images and topographic data for an area in NW Ishtar Terra, Venus (74”N, 313”E) contain evidence for the existence of a complex volcanic center. Located at the intersection
Pioneer Venus Radar results altimetry and surface properties
The radar altimeter carried aboard the Pioneer Venus orbiter spacecraft has yielded a topographic map covering 93% of the Venus globe, with a linear surface resolution of better than 150 km. Vertical
Styles of Volcanism on Venus: New Arecibo High Resolution Radar Data
Radar data of Venus provides strong evidence that the mountains in Beta and Eisila Regiones and plains in and adjacent to Guinevere Planitia are of volcanic origin and suggests that heat loss by abundant and widely distributed plains volcanism may be more significant than previously recognized.
Gravity Field of Venus: A Preliminary Analysis
The long-wavelength anomalies seen in the Venus gravity data have been Fourier-decomposed along the orbital tracks and compared to analogous spectra for Earth, suggesting differences in dynamic processes or lithospheric behavior, or both, for the two planets.
Constraints on the lithospheric structure of Venus from mechanical models and tectonic surface features
Radar images of the surface of Venus show numerous structures that are interpreted as having formed due to horizontal compression and extension of the lithosphere. Many of these features exhibit


Geologic interpretation of new observations of the surface of Venus
New radar observations of the surface of Venus provide further evidence of a diverse and complex geologic evolution. The radar bright feature "Beta" (24°N, 85°W) is seen to be a 700 km diameter
A radar image of Venus.
Pioneer Venus Radar Mapper Experiment
Altimetry and radar scattering data for Venus, obtained from 10 of the first 13 orbits of the Pioneer Venus orbiter, have disclosed what appears to be a rift valley having vertical relief of up to 7
Some Preliminary Results of the 70‐cm Radar Studies of Venus
Delay-Doppler positions of three radar features are given for observations made during the 1964, 1967, and 1969 inferior conjunctions of Venus. The latitude and longitude of each feature were
Venus: Further Evidence of Impact Cratering and Tectonic Activity from Radar Observations
Earth-based radar images at a resolution of 10 kilometers show a diverse surface terrain on Venus, probably produced by both impact events and tectonic activity. Only a small number of craters of
Venus radar images
Seven new radar images of portions of Venus are presented, along with corresponding altitude contours. Each is of a circular region of 1500-km diameter located near the Venusian equator. Areal
New Radar Image of Venus
A new radar image of Venus covering the latitude range 46� to 75� and the approximate longitude range 290� to 10� is shown. The resolution is approximately 20 kilometers.
Loriot of Massachusetts Iftstitute of Technology for valuable assistance in prepanng many aspects of the digital data