Is the four-day 'rotation' of Venus illusory

Details Is the four-day 'rotation' of Venus illusory Is the four-day 'rotation' of Venus illusory

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...24....1y&link_type=abstract

Icarus, vol. 24, Jan. 1975, p. 1-10.

Computer Science

8

Atmospheric Circulation, Illusions, Planetary Rotation, Traveling Waves, Ultraviolet Spectra, Venus Atmosphere, Error Analysis, Limbs, Red Shift, Solar Spectra, Terminator Lines, Venus Clouds, Wind Velocity

Scientific paper

An overlooked systematic error exists in the apparent radial velocities of solar lines reflected from regions of Venus near the terminator, owing to a combination of the finite angular size of the sun and its large equatorial velocity of rotation. This error produces an apparent, but fictitious, retrograde component of planetary rotation, typically on the order of 40 m/sec. Spectroscopic, photometric, and radiometric evidence against a 4-day atmospheric rotation is reviewed. The bulk of the somewhat contradictory evidence seems to favor slow motions, on the order of 5 m/sec, in the atmosphere of Venus; the 4-day 'rotation' may be due to a traveling wavelike disturbance, not bulk motions, driven by the UV albedo differences.

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