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  • Other Sources  (3)
  • 1995-1999  (2)
  • 1985-1989  (1)
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  • 1
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    Studies of Planetary Ring Systems (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: We propose to extend our current cooperative agreement for another three years to continue this highly productive collaboration. The extension will provide ongoing full-time support for Stanford Research Associate Mark R. Showalter (henceforth MRS). His activities are divided into three separate but closely related activities. First, he will continue to pursue a variety of scientific problems related to the ring systems of Jupiter, Saturn, Uranus and Neptune. Second, he will continue to manage the activities of the Planetary Data System (PDS) Rings Node located at NASA Ames. Third, for at least one more year he will oversee a project to develop a software package for planetary image processing and analysis.
    Keywords: Lunar and Planetary Exploration
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Jupiter's ring system - New results on structure and particle properties (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Jupiter's diffuse ring system is upon reexamination of Voyager images noted to be composed of a relatively bright narrow ring and an inner toroidal halo as well as the 'gossamer' exterior ring, while the previously suspected inner disk is missing. Several narrow, bright features are visible in the main ring, and are suggested to be related in some way to Adrastea and Metis. The smallest ring particles and the dark, rough, red largest bodies both have total optical depths of 1-6 x 10 to the -6th. After arising at the bright ring's inner boundary, the halo rapidly expands inward to a 20,000-km thickness, and disappears at a radius of 90,000 km halfway between the main ring and the planet's cloudtops.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 69; 458-498
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    NASA TECHNICAL REPORTS
  • 3
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    Arcs and Clumps in the Uranian Lambda Ring (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Careful reprocessing of the Voyager images reveals that the Uranian lambda ring has marked longitudinal variations in brightness comparable in magnitude to those in Saturn's F ring and Neptune's Adams ring. The ring's variations show a dominant five-cycle (72-degree) periodicity, although additional structure down to scales of about 0.5 degree is also present. The ring's shape is defined by a small overall eccentricity plus a six-cycle (60-degree) sinusoidal variation of radial amplitude around 4 kilometers. Both of these properties can be explained by the resonant perturbations of a moon at a semimajor axis of 56,479 kilometers, but no known moon orbits at this location. Unfortunately, the mass required suggests that such a body should have been imaged by Voyager.
    Keywords: Lunar and Planetary Exploration
    Type: NASA-TM-111970 , NAS 1.15:111970 , Science; 267; 490-493
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    NASA TECHNICAL REPORTS
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