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Temperatures and optical depths of Saturn's rings and a brightness temperature for Titan

Froidevaux, Lucien and Ingersoll, Andrew P. (1980) Temperatures and optical depths of Saturn's rings and a brightness temperature for Titan. Journal of Geophysical Research A, 85 (A11). pp. 5929-5936. ISSN 0148-0227. doi:10.1029/JA085iA11p05929. https://resolver.caltech.edu/CaltechAUTHORS:20130628-092233514

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Abstract

The Pioneer Saturn infrared radiometer viewed Saturn's rings at 20- and 45-µm wavelength under several conditions of illumination. The data are analyzed to infer radial locations of major ring boundaries, temperatures and temperature gradients, and normal optical depths. Error bounds on the above inferred quantities are given. Most ring boundaries are defined to ±0.01 R_s(1 R_s≡6 × 10^4 km) and are in good agreement with those inferred from the imaging photopolarimeter experiment. Temperatures generally decrease with radial distance from the planet. A significant temperature gradient exists from the colder north (unilluminated) side of the rings to the warmer south side. The gradient appears to be steepest on the south side. Ring optical depths are greater than some previously published values and are approximately 0.1 for the Cassini division and the C ring. In addition, the C ring optical depth decreases towards the planet. The temperature drop during eclipse is ≳10 K, implying low thermal inertia for the ring particles. Titan's 45-µm brightness temperature is 75±5 K, in good agreement with earth-based observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/JA085iA11p05929DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/JA085iA11p05929/abstractPublisherArticle
ORCID:
AuthorORCID
Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1980 by the American Geophysical Union. Received May 6, 1980; revised June 19, 1980; accepted June 21, 1980.
Issue or Number:A11
DOI:10.1029/JA085iA11p05929
Record Number:CaltechAUTHORS:20130628-092233514
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130628-092233514
Official Citation:Froidevaux, L., and A. P. Ingersoll (1980), Temperatures and optical depths of Saturn's rings and a brightness temperature for Titan, J. Geophys. Res., 85(A11), 5929–5936, doi:10.1029/JA085iA11p05929
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39136
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Jul 2013 23:02
Last Modified:09 Nov 2021 23:42

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