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Keck adaptive optics images of Jupiter’s north polar cap and Northern Red Oval

de Pater, Imke and Wong, Michael H. and de Kleer, Katherine and Hammel, Heidi B. and Ádámkovics, Máté and Conrad, Al (2011) Keck adaptive optics images of Jupiter’s north polar cap and Northern Red Oval. Icarus, 213 (2). pp. 559-563. ISSN 0019-1035.

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We present observations at near-infrared wavelengths (1–5 μm) of Jupiter’s north polar region and Northern Red Oval (NN-LRS-1). The observations were taken with the near-infrared camera NIRC2 coupled to the adaptive optics system on the 10-m W.M. Keck Telescope on UT 21 August 2010. At 5-μm Jupiter’s disk reveals considerable structure, including small bright rings which appear to surround all small vortices. It is striking, though, that no such ring is seen around the Northern Red Oval. In de Pater et al. [2010a. Icarus 210, 742–762], we showed that such rings also exist around all small vortices in Jupiter’s southern hemisphere, and are absent around the Great Red Spot and Red Oval BA. We show here that the vertical structure and extent of the Northern Red Oval is very similar to that of Jupiter’s Red Oval BA. These new observations of the Northern Red Oval, therefore, support the idea of a dichotomy between small and large anticyclones, in which ovals larger than about two Rossby deformation radii do not have 5-μm bright rings. In de Pater et al. [2010a. Icarus 210, 742–762], we explained this difference in terms of the secondary circulations within the vortices. We further compare the brightness distribution of our new 5-μm images with previously published radio observations of Jupiter, highlighting the depletion of NH_3 gas over areas that are bright at 5 μm.

Item Type:Article
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URLURL TypeDescription
de Pater, Imke0000-0002-4278-3168
Wong, Michael H.0000-0003-2804-5086
de Kleer, Katherine0000-0002-9068-3428
Hammel, Heidi B.0000-0001-8751-3463
Conrad, Al0000-0003-2872-0061
Additional Information:© 2011 Elsevier. Received 17 December 2010, Revised 28 February 2011, Accepted 4 March 2011, Available online 21 March 2011. All data were obtained with the W.M. Keck Observatory, which is operated by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. We benefitted greatly from the use of JPL’s Horizons system and SETI’s Planetary Rings Node. The authors extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, none of the observations presented would have been possible.
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:Jupiter, Atmosphere; Infrared observations; Adaptive optics
Issue or Number:2
Record Number:CaltechAUTHORS:20190424-103200979
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Official Citation:Imke de Pater, Michael H. Wong, Katherine de Kleer, Heidi B. Hammel, Máté Ádámkovics, Al Conrad, Keck adaptive optics images of Jupiter’s north polar cap and Northern Red Oval, Icarus, Volume 213, Issue 2, 2011, Pages 559-563, ISSN 0019-1035, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94927
Deposited By: George Porter
Deposited On:24 Apr 2019 20:04
Last Modified:09 Mar 2020 13:18

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