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  • LUNAR AND PLANETARY EXPLORATION  (190)
  • 1995-1999
  • 1980-1984  (190)
  • 1940-1944
  • 1982  (190)
  • 11
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    Antarctic meteorite descriptions, 1980 (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Specimens found in the Alan Hills area include 361 ordinary chondrites, 4 carbonaceous chondrites, 6 achondrites, and 2 irons. Thirteen specimens measured over 11 cm in diameter and 69 between 5 to 10 cm in diameter are reported. The remainder of the finds were small, and many were paired. One of the irons was estimated to weigh about 20 kilograms.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-84162 , NAS 1.15:84162 , JSC-18170 , PUBL-60
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  • 12
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    Compressional wave velocities of a lunar regolith sample in a simulated lunar environment (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ultrasonic compressional wave velocities have been measured in the laboratory for an Apollo 15 soil sample (15301, 38) under very low uniaxial stress and high vacuum conditions. The velocities measured range from 125 to 522 m/sec. The velocities of the soil are stress dependent and are strongly affected by compaction history. Hertzian contact theory does not appear to fit the data adequately for the pressure range of the experiment. Moderate increases in temperature do not have a significant effect on the compressional wave velocities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Mar. 10
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  • 13
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    Titan's upper atmosphere - Composition and temperature from the EUV solar occultation results (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is inferred from observation of an occultation of the sun by Titan, using the Voyager 1 UV spectrometer, that temperatures are 176 + or - 20 K near the evening terminator and 196 + or - 20 K near the morning terminator, and that the major atmospheric constituent is N2, with a density of 2.7 + or - 0.2 x 10 to the 8th/cu cm at 3840 km. A layer of absorbing molecules, possibly polymers, is found near both morning and evening terminators. A photochemical model suggests that the homopause is located at 3500 + or - 70 km, with an eddy diffusion coefficient of 1(+2, -0.7) x 10 to the 8th/sq cm per sec, which decreases to about 1000 sq cm/sec in the lower stratosphere as N2 to the -2/3 power.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Mar. 1
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  • 14
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    A comparative Rb-Sr, Sm-Nd, and K-Ar study of shocked norite 78236 - Evidence of slow cooling in the lunar crust (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The sample 78236 was chipped from the top of a norite boulder at Station 8 by the Apollo 17 landing team. Jackson et al. (1975) concluded that this rock formed at a depth of 8-30 km in the lunar crust and suggested that it was excavated by a large basin-forming impact event. A petrographic description of the boulder is provided, and isotopic analyses are discussed. Attention is given to a chronology for 78236 which seems to be most consistent with radiometric and other evidence. It is proposed that cumulate norite 78236 formed deep in the lunar crust approximately 4.4 AE ago. The rock cooled slowly in the crust until it was excavated by a major basin-forming event. Excavation may have occurred about 4.2 AE ago, but the time of this event is not well constrained.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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  • 15
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    Classification of the Johnson Space Center stratospheric dust collection (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Data on the nature of dust in the upper atmosphere have been provided by a stratospheric dust collection program. This program makes it possible to study in detail materials related to early solar system history. A comprehensive overview of the stratospheric collection program provides a basis for a better understanding of stratospheric dust origins. It is important for the development of this understanding that easily accessible criteria for classification be established. The present investigation is concerned with the development of a suitable classification scheme for the obtained stratospheric materials. Three sets of eight collectors were flown on WB57 high-altitude aircraft during August and September, 1981, as part of the considered collection program. Three of the 24 impactors (flags) have undergone preliminary examination. The current investigation is concerned with selected data on materials from flags W7010, W7017, and W7029.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
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  • 16
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    Ferromagnetic resonance intensity - A rapid method for determining lunar glass bead origin (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ferromagnetic resonance intensity, I(s), relies on the absence or presence of single-domain Fe formed during impact melting by autoreduction of Fe(2+) in the melt to distinguish volcanic from impact glass spherules in the lunar soil. SEM inspection of individual glass bead surfaces gave reliable evidence of the mode of glass genesis. Ferromagnetic resonance intensity was tested against the Apollo 15 and 17 volcanics. I(s) values of less than one were found in 94% of the volcanic glasses, implying the absence of single-domain Fe, while 75% of the impact glasses had elevated I(s) values. These samples lack single-domain Fe, and may represent impact melts of bedrock with little or no regolith contribution. Both the primary discrimination of volcanic and impact glasses, and the secondary one of bedrock-derived impact melts from impact melts partially or entirely derived from regolith, have been demonstrated for the I(s) technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
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  • 17
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    Compression of the Venusian ionosphere on May 10, 1979, by the interplanetary shock generated by the solar eruption of May 8, 1979 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Previous solar optical and solar wind conditions observations are summarized, and Venus ionopause data taken with the Helios 2 and Pioneer Venus Orbiter spacecraft are presented for orbits 150-161. Those orbits encountered the results of an interplanetary shock wave initiated by a solar eruption and coronal transient of May 8, 1979. A significant compression of the dayside Venus ionosphere was detected two days later. The solar observations had been made in H-alpha at 10 solar radii, at 0.3 AU, and at 0.7 AU, using plasma and magnetometer monitoring of the shock wave.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Nov. 1
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  • 18
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    The plumes of Titan (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The plasma density enhancements observed during the Voyager 1 Titan encounter are interpreted in terms of a single plume of plasma wrapped around Saturn by corotation. Consideration is given to the radial motions of the plume driven by fluctuations in solar wind pressure and the dispersal of the plasma by the centrifugal interchange instability, by heating, and by azimuthal acceleration. It is shown that Saturn cannot readily impose corotation directly on the plume and, incidentally, that the total dissipation associated with the Titan-magnetosphere interaction is insufficient to supply the power to produce the observed Titan ultraviolet airglow. A pickup velocity of 8 km/s is inferred on the basis of the observed velocity and a standing wave model. It is found that the Voyager plasma observations are consistent with the predictions of the model.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Oct. 1
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  • 19
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    Mars water vapor, near-surface (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In a previous paper we concluded that the temperature sensors aboard the Viking landers (VL-1 and VL-2) were detecting the water vapor frost point. Analysis of one Mars year of data at both lander sites substantiates this conclusion. At VL-1 it is found that the water vapor mixing ratio is constant with height through the bulk of the atmosphere, most of the time. Exceptions are during the onset phases of the two major dust storms when temporary enhancement of near-surface vapor occurs (the same phenomenon is observed at VL-2), and some depletion of near-surface vapor during the decay phase of the first storm, possibly the second storm as well. The former suggests near-surface, northward transport of water vapor with the storms. The latter suggests adsorption of vapor on dust particles followed by surface deposition. At VL-2, severe near-surface depletion of water vapor occurs during northern autumn and winter. The residual vapor is in equilibrium with the surface condensate observed at the site during this period, indicating that the source region for the condensate must be aloft with downward transport by dust fall-out. Since the near-surface water vapor mixing ratio and concentration at VL-1 generally parallels the column abundance over VL-1 obtained by the orbiters, this suggests that VL-1 can be used to give a measure of column abundance for as long as the temperature sensors remain operational.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Aug. 20
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  • 20
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    Detection of nonthermal continuum radiation in Saturn's magnetosphere (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A detailed analysis of high resolution wideband data from the Voyager 1 and 2 plasma wave receivers has revealed the presence of heretofore undiscovered nonthermal continuum radiation trapped within the Saturnian magnetosphere. The discovery of Saturnian trapped continuum radiation fills a disturbing void in the Saturnian radio spectrum. On the basis of observations at both the earth and Jupiter it was expected that continuum radiation should be a pervasive signature of planetary magnetospheres in general. Special processing of the Voyager 1 plasma wave data at Saturn has now confirmed the existence of weak emissions that have a spectrum characteristic of trapped continuum radiation. Similar radiation was also detected by Voyager 2; however, in this case it is not certain that Saturn was the only source. Considerable evidence exists which suggests that Saturn may have been immersed in the Jovian tail during Voyager 2 encounter, so that Jupiter may provide an additional source of the continuum radiation detected by Voyager 2.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 9; Aug. 198
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