Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..698s&link_type=abstract
Nature, vol. 292, Aug. 20, 1981, p. 698-702.
Astronomy and Astrophysics
Astronomy
68
Astronomical Photometry, Brightness Distribution, Satellite Atmospheres, Solar Heating, Titan, Albedo, Limb Darkening, Symmetry, Voyager 1 Spacecraft, Saturn, Satellites, Titan, Brightness, Asymmetry, Data, Photographs, Atmosphere, Optical Properties, Ultraviolet, Heating, Solar Radiation, Intensity, Phase Angles, Time Dependency, Albedo, Comparisons, Depth, Earth-Based Observations, Photometry, Neptune, Distribution, Patterns, Seasonal Variations, Composition, Aerosols, Models, Spectrum
Scientific paper
Voyager 1 images of Titan, when normalized to remove limb darkening, reveal an axially symmetric brightness pattern with significant north-south asymmetry. This interhemispheric contrast seems to be a response to seasonal solar heating variations resulting from Titan's inclined spin axis. The contrast significantly lags the solar forcing, indicating that its production involves the atmosphere well below the unit optical depth level. The contrast has a significant effect on Titan's disk-integrated brightness as seen from earth, and probably accounts for most of the observed long term variation, with solar UV variations accounting for the remainder.
Krauss Robert J.
Limaye Sanjay S.
Owen Theodore
Pollack James B.
Revercomb Henry E.
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