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  • LUNAR AND PLANETARY EXPLORATION  (19)
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  • 1
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    A Note on Jupiter's Gossamer Ring (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The newly discovered gossamer ring of Jupiter, composed largely of micron-sized grains, exhibits a significant peak very near the synchronous radius. It is believed that this peak is associated with an unobserved source consisting of large bodies that straddle the synchronous orbit. An alternative evolutionary mechanism is offered, which is the gyrophase drift towards the synchronous orbit, of fine grains, which necessarily are electrostatically charged within the Jovian magnetosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: California Univ., San Diego, La Jolla Trapped Particle Absorption by the Ring of Jupiter; 9 p
    Format: text
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  • 2
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    Gravito-electrodynamics and the structure of planetary ring systems (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Recent spacecraft observations of the Saturnian and Jovian ring systems have highlighted a plethora of interesting new phenomena associated with those regions containing fine (micron and sub-micron sized) dust. Recognizing that these dust grains, by virtue of being immersed within the planetary magnetospheres, are electrostatically charged to the point that they experience comparable gravitational and electric forces, a new 'gravito-electrodynamic' theory has been developed to describe their dynamics. This theory has been successful in explaining all these phenomena in a systematic way. In this review, the basic model and its range of validity are outlined, and its application to the Saturnian and Jovian ring systems are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: (ISSN 0370-0089); 93; 177-188
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  • 3
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    On the nature of the interaction of the Jovian magnetosphere with the icy Galilean satellites (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The effects of plasma and micrometeoroid bombardment of each satellite are considered in the case of interactions between the Jovian magnetosphere and Europa, Ganymede, and Callisto, in an attempt to understand the influences of these exogenic processes on the surface properties of each of the three moons. Sublimated and sputtered H2O results in a net O2 atmosphere on each of the three moons, and the effectiveness of such an atmosphere in preventing the Jovian plasma from reaching each satellite surface is considered for a variety of magnetospheric conditions. Also studied are the effects of possible satellite magnetic field magnitude and orientation, in order to estimate satellite magnetosphere properties, and the orbits of charged micrometeroids in the Jupiter magnetosphere, in order to determine the relative flux of these particles over the satellite surfaces.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; June 1
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  • 4
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    On the equatorial transport of Saturn's ionosphere as driven by a dust-ring current system (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The diurnal modulation of the dust ring current of Saturn's D-ring causes field-aligned Birkeland currents to flow near the dawn and dusk terminators and close across the midlatitude ionosphere. One consequence of this current system is the establishment of a global convection pattern in the equatorial outer ionosphere. Outward motion of the dayside ionospheric plasma as well as the corresponding absorption effect of the inner ring system might be one physical cause of the depletion of the ionospheric content of Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 10; Mar. 198
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  • 5
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    On the braids and spokes in Saturn's ring system (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Two of the features in the Saturnian ring system recently observed by the Voyager 1 spacecraft are (1) the braiding of the F-ring and (2) the radial spokes that rotate across the B-ring. Both of these phenomena are explained by recognizing that the grains that constitute both the F-ring and the spokes are charged to high electrostatic potentials and are sufficiently small to be strongly affected by the magnetic field of the planet. Processes for the charging of the grains are also suggested.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Moon and the Planets; 24; June 198
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  • 6
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    Charged dust in the outer planetary magnetospheres. II - Trajectories and spatial distribution (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The dynamics of the electrostatic disruption products of fragile interplanetary dust aggregates which are initially electrically charged on entering the Jovian plasmasphere is considered. The detailed orbits of these charged particles, which are shown to be confined to the equatorial plane, are computed. It is found that the fragments with radii typically about 1 micron are magnetogravitationally trapped within the plasmasphere due to the velocity-induced oscillation of their surface potentials. It is suggested that the distribution of micrometeroid dust within the Jovian magnetosphere, observed by Pioneer 10 and the recent Voyager, is a result of the magnetogravitational trapping and subsequent orbital evolution of these charged dust particles.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Moon and the Planets; 23; Aug. 198
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  • 7
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    The isolated non-circular ringlets of Saturn (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is shown that the combined effect of electrodynamic and gravitational forces can account for a number of features observed by Voyagers 1 and 2 in the isolated fine dust rings of Saturn. These include the appearance and disappearance of the braids in the F-ring, the eccentricities of the F-ring and the ringlets within the Encke and Cassini divisions and a gap in the C-ring, and the kinks in the eccentric Encke ring. They may also account for the very existence of these rings.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Moon and the Planets; 26; Apr. 198
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  • 8
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    Charged dust in the outer planetary magnetospheres. III - Satellite impact geometries (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Interplanetary dust grains entering the Jovian plasmasphere become charged, and those in a certain size range get magneto-gravitationally trapped in the corotating plasmasphere. The trajectories of such dust grains intersect the orbits of one or more of the Galilean satellites. Orbital calculations of micron sized dust grains show that they impact the outermost satellite Callisto predominantly on its leading face, while they impact the inner three - Io, Europa and Ganymede - predominantly on the trailing face. These results are offered as an explanation of the observed brightness asymmetry between the leading and trailing faces of the outer three Galilean satellites. The albedo of Io is likely to be determined by its volcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Moon and the Planets; 25; Dec. 198
    Format: text
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  • 9
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    The study of cometary plasmas using artificial comets launched from the space shuttle (1976)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The agents responsible for observed (transient) cometary phenomena are solar radiation and solar wind. The evaporation of cometary snows and the dissociation and ionization of the resulting gas molecules are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Marshall Space Flight Center Proc. of the Shuttle-Based Cometary Sci. Workshop; p 238-248
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  • 10
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    The gravito-electrodynamics of charged dust in planetary ring systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The dynamics of micron and submicron sized dust grains moving under the combined influence of planetary gravitation and the electromagnetic forces within the corotating regions of planetary magnetospheres are discussed. Magnetogravitational capture of charged grains in planetary rings is outlined. The adiabatic motion of charged dust is reviewed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: CNES Planetary Rings; p 631-643
    Format: text
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