Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images

Details Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images Neptune's cloud structure in 1989 - Photometric variations and correlation with ground-based images

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...90..299l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 90, April 1991, p. 299-307.

Physics

10

Cloud Physics, Light Curve, Neptune Atmosphere, Planetary Meteorology, Satellite Imagery, Space Observations (From Earth), Charge Coupled Devices, Digital Techniques, Electrophotometry, Methane, Secular Variations, Voyager 2 Spacecraft, Neptune, Clouds, Structure, Photometry, Earth-Based Observations, Surface, Ccd Methods, Features, Brightness, Distribution, Lightcurve, Visible Light, Wavelengths, Photoelectric Methods, Spectrophotometry, Procedure, Periodicity, Great Dark Spot, Color, Intensity, Magnitude,

Scientific paper

Ground-based photoelectric photometry in b, y, and the 6190 and 7250 A methane-bands, as well as spectrum scans of the methane 6190 A band and CCD images at 6190 and 8900 A, were obtained for Neptune during Voyager 2's approach of that planet on August 24, 1989. Photometric variations are presently correlated with the disk transit of bright planetary features, and the changes in feature distribution and brightness noted in the results are evaluated for implications bearing on long-term variability. It is suggested that the long-term secular variation is related to a slow change in a size of location of both the bright companion and the Great Dark Spot.

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