Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8745h&link_type=abstract
Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8745-8749.
Physics
30
Atmospheric Circulation, Cyclones, Flow Velocity, Jupiter Atmosphere, Oscillating Flow, Cinematography, Velocity Distribution, Vorticity, Voyager Project, Zonal Flow (Meteorology), Jupiter, Voyager 1, Voyager 2, Structure, Flow, Current, Data, Vortex, Rotation, Motions, Photographs, Circulation, Features, Velocity
Scientific paper
Dark brown cyclonic spots ('barges') at 14 deg N were studied by using Voyager 1 and 2 images of Jupiter. Movie sequences were made to study the spots' behavior over intervals of 50 days and longer. These movies revealed that the length and width vary by + or - 9% with a period of about 15 days, while the area remains approximately constant. The horizontal velocity field was investigated for an interval of about 1 day. Flow around the largest barge occurs as a ring current. The vorticity inferred is about 2 1/2 times that of the ambient cyclonic zonal circulation, and about one-half the value of the local planetary vorticity. Length and width variations appear to be associated with a nonzero horizontal divergence field. If the oscillations are a natural mode of the system, the 15-day period will provide an important datum for testing models of stable closed vortices.
Danielson Edward G.
Hatzes Artie
Ingersoll P. A. P. A.
Wenkert Daniel
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