Rotation of Venus's polar dipole

Details Rotation of Venus's polar dipole Rotation of Venus's polar dipole

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.305..116s&link_type=abstract

Nature (ISSN 0028-0836), vol. 305, Sept. 8, 1983, p. 116-119.

Physics

14

Planetary Mapping, Planetary Rotation, Polar Wandering (Geology), Thermal Mapping, Venus Clouds, Atmospheric Circulation, Dipoles, Pioneer Venus 1 Spacecraft, Planetary Temperature, Polar Meteorology, Secular Variations, Venus, Rotation, Polar Regions, Dipoles, Thermal Properties, Emissions, Periods, Orbiter Infrared Radiometer, Oir, Pioneer Venus Orbiter, Pvo, Imagery, Oscillations, Brightness Temperature, Longitude, Latitude, Data, Amplitude

Scientific paper

The venusian polar dipoles are long-lived, elongated, warm features seen in images of thermal emission from the polar cloud tops of the planet. They are almost 4,000 km across, are centred close to the pole, and appear to rotate with a period of ≡3 days retrograde. The northern hemisphere dipole was first identified by the Orbiter Infrared Radiometer (OIR) on the Pioneer Venus Orbiter. The authors use OIR images at 11.5 μm to investigate its detailed rotation. Its rotation rate is observed to change steadily over the 72-day data set, and there is some evidence for oscillatory variations superimposed on this trend.

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