Longitudinal variability of methane and ammonia bands on Jupiter

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

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..102c&link_type=abstract

Icarus, vol. 42, Apr. 1980, p. 102-110.

Computer Science

7

Ammonia, Jupiter Atmosphere, Methane, Planetary Composition, Absorption Spectra, Atmospheric Models, Data Reduction, Electrophotometry, Equatorial Atmosphere, Molecular Absorption, Radiative Transfer, Reflectance, Signal To Noise Ratios, Variability, Jupiter, Ammonia, Bands, Methane, Spectrum, Bandwidths, Longitude, Reflectivity, Clouds, Observations, Data, Data Reduction, Models, Theoretical Studies, Layers, Atmosphere, Absorption, Procedure, Wavelengths, Scattering, Pressure, Radiative Transfer, Parameter

Scientific paper

Results of a quantitative study of the longitudinal variations of methane and ammonia absorption on Jupiter are presented. A total of 78 high signal-to-noise ratio photoelectric spectra in the range 6000 to 6600 A were obtained on two consecutive nights, with complete longitudinal equatorial coverage each night through 9-min exposures covering a total of over 9 h. Analysis of the equivalent widths of the CH4 6190 A and NH3 6450 A absorption bands by means of a blind, automated, self-consistent method of continuum determination reveals large equivalent widths in both bands near longitudes of 35 and 340 deg and small equivalent widths near 150 deg, with a high degree of correlation between the equivalent widths of the bands. Continuum molecular absorption is found to be slightly negatively correlated with band equivalent widths. Radiative transfer calculations based on the model of Sato and Hansen (1979) using a doubling and adding technique indicate that the observed longitudinal variables of equivalent widths and continuum reflectivity are the results of longitudinal variations in ammonia cloud altitude.

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