Kaspi, Yohai and Hubbard, William B. and Showman, Adam P. and Flierl, Glenn R. (2010) Gravitational signature of Jupiter’s internal dynamics. Geophysical Research Letters, 37 . Art. No. L01204. ISSN 0094-8276 http://resolver.caltech.edu/CaltechAUTHORS:20100212-160038849
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Telescopic observations and space missions to Jupiter have provided vast information about Jupiter's cloud level winds, but the depth to which these winds penetrate has remained an ongoing mystery. Scheduled to be launched in 2011, the Jupiter orbiter Juno will make high-resolution observations of Jupiter's gravity field. In this paper we show that these measurements are sensitive to the depth of the internal winds. We use dynamical models ranging from an idealized thermal wind balance analysis, using the observed cloud-top winds, to a full general circulation model (GCM). We relate the depth of the dynamics to the external gravity spectrum for different internal wind structure scenarios. In particular, we predict that substantial Jovian winds below a depth of 500 km would lead to detectable (milligal-level) gravity anomalies with respect to the expected gravity for a planet in solid body rotation.
|Additional Information:||© 2010 American Geophysical Union. Received 19 October 2009; revised 19 November 2009; accepted 7 December 2009; published 15 January 2010. We thank Andrew Ingersoll, Tapio Schneider, David Stevenson, and two anonymous reviewers for their comments and suggestions. This research has been supported by NSF grant AST-0708106 (Y.K., A.S. and G.F), NASA grant NNX07AF35G (A.S.), the NOAA Climate and Global Change Postdoctoral Fellowship administered by the University Corporation for Atmospheric Research. (Y.K.) and the Juno project (W.H.).|
|Subject Keywords:||Juno ; Jupiter gravity ; Jupiter interior|
|Official Citation:||Kaspi, Y., W. B. Hubbard, A. P. Showman, and G. R. Flierl (2010), Gravitational signature of Jupiter's internal dynamics, Geophys. Res. Lett., 37, L01204, doi:10.1029/2009GL041385.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||16 Feb 2010 19:45|
|Last Modified:||26 Dec 2012 11:46|
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