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  • LUNAR AND PLANETARY EXPLORATION  (111)
  • 1985-1989  (111)
  • 1980-1984
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  • 1987  (111)
  • 1
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    Electrostatic waves in the magnetosphere of Uranus (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of electrostatic waves in the magnetosphere of Uranus are discussed with attention focused on the Bernstein emissions. The most intense Bernstein waves were observed near the magnetic equator of the planet, even though the tilt of the Uranian magnetic moment is very large relative to the rotational axis. In addition to the Bernstein modes, a number of highly sporadic emissions were detected in the vicinity of the Miranda L shell.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 15225-15
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    NASA TECHNICAL REPORTS
  • 2
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    The atmosphere of Uranus - Results of radio occultation measurements with Voyager 2 (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Uranian atmosphere is investigated on the basis of S-band and X-band occultation observations (including measurements of Doppler frequency perturbations) obtained during the Voyager 2 encounter with Uranus in January 1986. The data are presented in extensive tables and graphs and characterized in detail. The atmosphere is assumed to have an H2/He abundance ratio of about 85/15, but also to contain small amounts of CH4 at above-cloud relative humidity 30 percent, cloud-base relative humidity 78 percent, and below-cloud mixing ratio 2.3 percent by number density. Other parameters estimated include magnetic-field rotation period 17.24 h, 1-bar equatorial radius 25,559 + or - 4 km, polar radius 24,973 + or - 20 km, equatorial acceleration of gravity 8.69 + or - 0.01 m/sec sq, and atmospheric temperature 76 + or - 2 K (assuming 85 + or - 3 percent H2).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 14987-15
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    NASA TECHNICAL REPORTS
  • 3
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    Geochronology of high-K aluminous mare basalt clasts from Apollo 14 breccia 14304 (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Two aluminous mare basalt clasts of high K abundances from Apollo 14 breccia 14304 (the 14304,127 and 14304,128 samples) were characterized with respect to the Rb and Sr concentrations and isotopic compositions, and the Rb-Sr, K-Ar, and Sm-Nd isotopic age determinations were carried out. The results suggest that these high-K basalts were melts derived from mantle material and that they have experienced about ten-fold Rb/Sr and K/La enrichments at approximately the time of crystallization.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 51; 3255-327
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  • 4
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    Properties of planetary fluids at high pressure and temperature (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In order to derive models of the interiors of Uranus, Neptune, Jupiter and Saturn, researchers studied equations of state and electrical conductivities of molecules at high dynamic pressures and temperatures. Results are given for shock temperature measurements of N2 and CH4. Temperature data allowed demonstration of shock induced cooling in the the transition region and the existence of crossing isotherms in P-V space.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 141-143
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  • 5
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    Evidence for first polymer in Comet Halley: Polyoxymethylene (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The RPA2-Positive Ion Cluster Composition Analyzer (PICCA) on the Giotto spacecraft detected 5 mass peaks with regular spacing of 15 amu up to approximately 120 amu. Starting at 45 amu, the peaks decrease in intensity with increasing mass. Within their half-width they are in good agreement with dissociation products of formaldehyde polymer (POM). A production sequence in which cosmic radiation formed POM from water and carbon monoxide on grains that were aggregated into cometesimals is suggested. Other polymers, possibly containing CN, may also exist. Observations suggest that at least some of the H-, C-, and O-containing dust particles detected by the Particle Impact Analyzer (PIA) on board the Giotto spacecraft and its equivalent on the VEGA-1 and -2 spacecraft contain POM. The properties of POM are consistent with many of the unexpected observations in the coma.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets; p 163-167
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  • 6
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    Particle formation and interaction (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: A wide variety of experiments can be conducted on the Space Station that involve the physics of small particles of planetary significance. Processes of interest include nucleation and condensation of particles from a gas, aggregation of small particles into larger ones, and low velocity collisions of particles. All of these processes could be investigated with a general purpose facility on the Space Station. The microgravity environment would be necessary to perform many experiments, as they generally require that particles be suspended for periods substantially longer than are practical at 1 g. Only experiments relevant to planetary processes will be discussed in detail here, but it is important to stress that a particle facility will be useful to a wide variety of scientific disciplines, and can be used to address many scientific problems.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Lyndon B. Johnson Space Center, Experiments in Planetary and Related Sciences and the Space Station; 4 p
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  • 7
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    Radio science with Voyager 2 at Uranus - Results on masses and densities of the planet and five principal satellites (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Phase-coherent Doppler data generated by the Deep Space Network with the radio communication system during the Voyager 2 encounter with Uranus in January 1986, optical navigation data generated by the Voyager Navigation Team with the Voyager 2 imaging system, and ground-based astrometric data obtained over an 8-yr period are compiled and analyzed to determine the masses and densities of Uranus and its principal satellites. The data-analysis procedures are explained in detail, and the results are presented in tables and graphs. The mean density of Uranus is found to be 1.285 + or - 0.001 g/cu cm, whereas the mean uncompressed mass of all five satellites is 1.48 + or - 0.06 g/cu cm, or 0.10 g/cu cm above the density expected for a homogeneous solar mix of rock, H2O and NH3 ice, and CH4 as clathrate hydrate. This difference is tentatively attributed to the presence of 15 mass percent of pure graphite, which would provide the thermal conductivity required to keep the satellites cold and undifferentiated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 14877-14
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  • 8
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    Detection of neutral oxygen and sulfur emissions near Io using IUE (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: IUE spectra have shown several O I and S I emissions near Io. The optical thickness of the S I 1814 A multiplet indicates that the S column density is greater than about 2 x 10 to the 12th/sq cm. The presence of an S I 1479 A feature suggests that electron collisions with SO2 could be a major source of the emissions. It is likely that particle excitation in the denser collision-dominated part of the atmosphere is also responsible for a substantial part of the observed emissions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 319; L33-L38
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  • 9
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    Titan's atomic nitrogen torus - Inferred properties and consequences for the Saturnian aurora (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A population of warm, approximately keV N(-) ions furnishing the greater part of the mass and energy input to the Titan magnetosphere, at a power level of 2 x 10 to the 11th W, is generated by ionization of Titan's nitrogen torus by both solar EUV photons and magnetospheric electron impact. Magnetospheric electrons also accelerate pickup ions to keV energies by means of lower hybrid emissions, on a time scale comparable to the plasma residence time. It is presently suggested that the aurora is excited by ion and electron precipitation from the outer magnetosphere; the energetics in question can be accounted for entirely on the basis of the titanogenic plasma supply proper to a corotation-dominated magnetosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 72; 53-61
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  • 10
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    Comment on 'Periodic amplitude variations in Jovian continuum radiation' by W. S. Kurth et al. (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 11269-11
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