Temporal variability of ultraviolet cloud features in the Venus stratosphere

Details Temporal variability of ultraviolet cloud features in the Venus stratosphere Temporal variability of ultraviolet cloud features in the Venus stratosphere

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..391d&link_type=abstract

(International Conference on the Venus Environment, Palo Alto, CA, Nov. 1-6, 1981.) Icarus, vol. 51, Aug. 1982, p. 391-415.

Astronomy and Astrophysics

Astronomy

29

Brightness, Stratosphere, Ultraviolet Astronomy, Venus Atmosphere, Venus Clouds, Pioneer Venus 1 Spacecraft, Polarimeters, Power Spectra, Temporal Distribution, Time Series Analysis

Scientific paper

The observed temporal variability of ultraviolet cloud brightness in over two months of Pioneer Venus Orbiter Cloud Photopolarimeter imaging is considered. It is found that the longitudinal mean brightness record shows evidence of two planetary-scale waves. One appears to be centered on the equator but has significant amplitude at all latitudes. The other is centered at midlatitudes and is more confined latitudinally. Visually, the two waves correspond to the longitudinal motion of the dark equatorial band and the oscillation in latitude of the bright polar bands, respectively. The slope of the longitudinal cloud brightness power spectrum at intermediate wavenumbers fluctuates with a periodicity of approximately 2-3 weeks in southern midlatitudes. The polar regions in both hemispheres vary in brightness on a time scale of approximately two months. The disk-integrated brightness increased with time throughout the nominal mission.

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