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High-Resolution Microwave Images of Saturn

Grossman, A. W. and Muhleman, D. O. and Berge, G. L. (1989) High-Resolution Microwave Images of Saturn. Science, 245 (4923). pp. 1211-1215. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20150204-145701950

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Abstract

An analysis of high-resolution microwave images of Saturn and Saturn's individual rings is presented. Radio interferometric observations of Saturn taken at the Very Large Array in New Mexico at wavelengths of 2 and 6 centimeters reveal interesting new features in both the atmosphere and rings. The resulting maps show an increase in brightness temperature of about 3 K from equator to pole at both wavelengths, while the 6-centimeter map shows a bright band at northern mid-latitudes. The data are consistent with a radiative transfer model of the atmosphere that constrains the well-mixed, fully saturated, NH_3 mixing ratio to be 1.2 x 10^-4 in a region just below the NH_3 clouds, while the observed bright band indicates a 25 percent relative decrease of NH_3 in northern mid-latitudes. Brightness temperatures for the classical rings are presented. Ring brightness shows a variation with azimuth and is linearly polarized at an average value of about 5 percent. The variations in ring polarization suggest that at least 20 percent of the ring brightness is the result of a single scattering process.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.245.4923.1211 DOIArticle
http://www.sciencemag.org/content/245/4923/1211PublisherArticle
http://www.jstor.org/stable/1704230JSTORArticle
Additional Information:© 1989 American Association for the Advancement of Science. 24 May 1989; accepted 25 July 1989. We thank the scientists and staff of the VLA for their support. This is contribution number 4753 of the Division of Geological and Planetary Sciences, California Institute of Technology. This research was supported in part by NSF grant ATS8601111 and NASA grant NAGW 1448.
Funders:
Funding AgencyGrant Number
NSFATS8601111
NASANAGW 1448
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Caltech Division of Geological and Planetary Sciences4753
Record Number:CaltechAUTHORS:20150204-145701950
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150204-145701950
Official Citation:GROSSMAN, A. W., MUHLEMAN, D. O., & BERGE, G. L. (1989). High-Resolution Microwave Images of Saturn. Science, 245(4923), 1211-1215. doi: 10.1126/science.245.4923.1211
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54384
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:05 Feb 2015 20:42
Last Modified:05 Feb 2015 20:42

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