Longitudinal variability of methane and ammonia bands on Saturn

Details Longitudinal variability of methane and ammonia bands on Saturn Longitudinal variability of methane and ammonia bands on Saturn

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...48..488c&link_type=abstract

Icarus, vol. 48, Dec. 1981, p. 488-495.

Astronomy and Astrophysics

Astronomy

14

Absorption Spectra, Ammonia, Methane, Saturn Atmosphere, Spectral Bands, Spectral Line Width, Altitude, Atmospheric Composition, Cloud Cover, Molecular Spectra, Reflectance, Statistical Correlation, Variations, Saturn, Methane, Ammonia, Longitude, Spectra, Procedure, Reflectivity, Absorption, Latitude, Models, Altitude, Clouds, Hypotheses, Diagrams, Analysis, Astronomy, Earth-Based Observations

Scientific paper

A total of 129 spectra of the center of the disk of Saturn were obtained in March 1980 in order to search for possible longitudinal variations in the CH4 6190 and NH3 6450 bands. The spectra were reduced to reflectivities, and the band equivalent widths were measured using a blind, automated continuum fitting technique. The methane and ammonia equivalent widths are well correlated with each other. There are some latitude regions in which both bands show enhanced absorption and some latitudes in which both bands are weaker than the average. The continuum reflectivity is quite constant with latitude and shows no apparent correlation with molecular band equivalent width. The observed variations may be explained by a longitudinal variation in the altitude of the top of the thick cloud of about + or - 2 km from the mean.

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