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Spiral structure as an explanation for the asymmetric brightness of Saturn's A ring

Colombo, G. and Goldreich, P. and Harris, A. W. (1976) Spiral structure as an explanation for the asymmetric brightness of Saturn's A ring. Nature, 264 (5584). pp. 344-345. ISSN 0028-0836. https://resolver.caltech.edu/CaltechAUTHORS:20130418-072712096

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Abstract

REITSEMA et al. and Lumme and Irvine have recently confirmed earlier observations which suggested that the A ring of Saturn is fainter in the quadrants following conjunctions of the particles with the Earth–Saturn line and brighter in the quadrants preceding conjunctions. Surprisingly, no intrinsic azimuthal brightness variation is found in the B ring. The brightness variation has been linked to the presence of synchronously rotating particles in the A ring, the effect caused by either a systematic variation in albedo over their surfaces or variations in their geometric projections. Of these two possibilities, the latter seems more promising since the asymmetry of the brightness variation with respect to the Earth–Saturn line is difficult to account for by means of an albedo variation. Furthermore, an albedo variation would yield the same brightness pattern for the B ring if it contained synchronously rotating particles. In this paper, however, we propose yet another mechanism to explain the phenomenon—spiral wakes in the A ring.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1038/264344a0DOIUNSPECIFIED
http://www.nature.com/nature/journal/v264/n5584/abs/264344a0.htmlPublisherUNSPECIFIED
ORCID:
AuthorORCID
Harris, A. W.0000-0001-7431-2013
Additional Information:© 1976 Nature Publishing Group. Received august 25; accepted October 7, 1976.
Issue or Number:5584
Record Number:CaltechAUTHORS:20130418-072712096
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130418-072712096
Official Citation:Spiral structure as an explanation for the asymmetric brightness of Saturn's A ring 344 G. COLOMBO, P. GOLDREICH & A. W. HARRIS doi:10.1038/264344a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38004
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Apr 2013 18:24
Last Modified:09 Mar 2020 13:18

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