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Interaction of eddies and mean zonal flow on Jupiter as inferred from Voyager 1 and 2 images

Ingersoll, Andrew P. and Beebe, Reta F. and Mitchell, Jim L. and Garneau, Glenn W. and Yagi, Gary M. and Müller, Jan-Peter (1981) Interaction of eddies and mean zonal flow on Jupiter as inferred from Voyager 1 and 2 images. Journal of Geophysical Research A, 86 (A10). pp. 8733-8743. ISSN 0148-0227.

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Voyager 1 and 2 narrow-angle frames were used to obtain displacements of features at resolutions of 130 km over time intervals of 1 Jovian rotation. The zonal velocity ū was constant to 1.5% during the 4 months between the Voyager 1 and 2 encounters. The latitudes of the zonal jet maxima (extrema of ū) are the same as inferred from earth-based observations extending over the past 80 years. The curvature of the velocity profile d²ū/dy² varies with latitudinal coordinate y in the range from −3β to +2β, where β is the planetary vorticity gradient. The barotropic stability criterion is violated at about 10 latitudes between ±60°. The eddy momentum flux variation with latitude (u'ν')(overbar) is positively correlated with dū/dy for both Voyager 1 and 2 data. The rate of conversion {K'K(overbar)} of eddy kinetic energy into zonal mean kinetic energy is in the range 1.5–3.0 Wm^(−2), for a layer 2.5 bar deep. The time constant for resupply of zonal mean kinetic energy by eddies is in the range 2–4 months, less than the interval between Voyager encounters. The rate of energy conversion is more than 10% of the total infrared heat flux for Jupiter, in contrast with earth where it is only 0.1% of the infrared heat flux. This hundred-fold difference suggests that the thermomechanical energy cycles are very different on the two planets.

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Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1981 American Geophysical Union. Received July 31, 1980; revised December 1, 1980; accepted December 8, 1980. We thank members of the Voyager Project and the Image Processing Laboratory for their assistance. Brad Smith, as Imaging Science Team Leader, provided support and encouragement. Daniel Wenkert and Michael Kroupa helped with the data analysis. Contribution number 3489 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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Caltech Division of Geological and Planetary Sciences3489
Issue or Number:A10
Record Number:CaltechAUTHORS:20130502-131722526
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Official Citation:Ingersoll, A. P., R. F. Beebe, J. L. Mitchell, G. W. Garneau, G. M. Yagi, and J.-P. Müller (1981), Interaction of eddies and mean zonal flow on Jupiter as inferred from Voyager 1 and 2 images, J. Geophys. Res., 86(A10), 8733–8743, doi:10.1029/JA086iA10p08733.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38242
Deposited By: Jason Perez
Deposited On:03 May 2013 20:44
Last Modified:03 Oct 2019 04:55

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