Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...254..684s&link_type=abstract
Science (ISSN 0036-8075), vol. 254, Nov. 1, 1991, p. 684-686. Research supported by NASA.
Physics
9
Atmospheric Circulation, Cloud Physics, Neptune Atmosphere, Periodic Variations, Atmospheric Models, Infrared Spectrometers, Oscillations, Voyager Project
Scientific paper
Voyager observations suggest that three of Neptune's major cloud features oscillate in latitude by 2 to 4 deg and that two of them simultaneously oscillate in longitude by 7.8 and 98 deg about their mean drift longitudes. The observations define most convincingly the two orthogonal oscillations of the second dark spot (near 53 deg south). These oscillations have similar periods near 800 hours and approximately satisfy a simple advective model in which a latitudinal oscillation produces a phase-shifted longitudinal oscillation proportional to the local wind shear. The latitudinal motion of the Great Dark Spot can be fit with an oscillation period of about 2550 hours, whereas its dominant longitudinal motion, if oscillatory at all, has such a long period that it is not well constrained by the Voyager data.
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