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  • Chemistry  (6,722)
  • LUNAR AND PLANETARY EXPLORATION  (552)
  • Physics  (538)
  • 1980-1984  (7,812)
  • 1983  (7,812)
  • 1
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    Crater numbers and geological histories of Iapetus, Enceladus, Tethys and Hyperion (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The surfaces of the Saturn satellites Tethys, Iapetus and Encedalus display surfaces which indicate active geological processes and therefore suggest a degree of internal evolution. By contrast, the Saturn satellite Hyperion and the coorbitals 1980S1 and 1980S3 show no trace of geological activity and may be fragments of once-larger bodies. Activity on Iapetus appears to have been confined to the dark terrain, and offers no clue as to its timing and extent. The widest terrain type and crater number variations are those of Encedalus, which indicate the most prolonged period of geological activity of any of the satellites studied.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 301; Feb. 24
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Construction of a model of the Venus surface and its use in processing radar observations (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An algorithm is described for constructing the model of the Venus surface as an expansion in spherical functions. The relief expansion coefficients were obtained up to the coefficient S sub 99. The surface picture representation is given according to this expansion. The surface model constructed was used for processing radar observations. The use of the surface model allows improved agreement between the design and measured values of radar ranges.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77298 , NAS 1.15:77298
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Etching of moldavities under natural conditions (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The hypothesis that a part of the lechatellierites which originated by etching from a basic moldavite mass became broken off after deposition of moldavite in the sedimentation layer is advanced. Those found close to the original moldavite were measured for statistical averaging of length. The average length of lechatelierite fibers per cubic mm of moldavite mass volume was determined by measurement under a microscope in toluene. The data were used to calculate the depth of the moldavite layer that had to be etched to produce the corresponding amount of lechatelierite fragments. The calculations from five "fields" of moldavite surface, where layers of fixed lechatelierite fragments were preserved, produced values of 2.0, 3.1, 3.5, 3.9 and 4.5. Due to inadvertent loss of some fragments the determined values are somewhat lower than those found in references. The difference may be explained by the fact that the depth of the layer is only that caused by etching after moldavite deposition.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77334 , NAS 1.15:77334
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The detection of X rays from Jupiter (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: X rays in the energy band 0.2-3.0 keV have been detected coming from both polar regions of Jupiter. The observations were made in 1979 and 1981 by using the imaging proportional counter and high resolution imaging detectors on the Einstein X-ray astronomy satellite. The measured flux density of approximately 0.0006/sq cm-sec at earth corresponds to an X ray luminosity of approximately 4 x 10 to the 9th W in the 0.2- to 3.0-keV energy band. The energy spectrum of the X rays is extremely soft and can be characterized by a power law with an exponent of approximately 2.3. Detector energy resolution is insufficient to distinguish a soft line spectrum from a continuum. However, the shape of the response and the observed X ray power indicate that the source of this auroral emission is not electron bremsstrahlung as on the earth, but is most probably line emission from O and S ions with energies between 0.03 and 4.0 MeV/nucleon precipitating from the outer boundary of the Io plasma torus at L approximately 8.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Oct. 1
    Format: text
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  • 5
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    Planetary exploration through year 2000: A core Program, part 1 (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Core Program, goals for planetary exploration, continuity and expansion, core program missions, mission implementation, anticipated accomplishments, resource requirements, and near term budget decisions are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-85288 , NAS 1.15:85288
    Format: application/pdf
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  • 6
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    Planetary exploration through year 2000: A CORE program, part 1 (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Mission definitions and priorities; target selections; program strategy; historical settings; major scientific goals; spacecraft exploration; and planetary missions are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-88653 , NAS 1.15:88653
    Format: application/pdf
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  • 7
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    Periods of activity cycles in late-type stars (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The mean magnetic field dynamo theory is utilized to obtain the qualitative dependence of the period of activity on the angular velocity of rotation for stars with sufficiently extensive convective shells. The dependence of the cycle period on the spectral class is also discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77297 , NAS 1.15:77297
    Format: application/pdf
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  • 8
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    Preliminary discussion on the origin of Lei-gong-mo (tektites) (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The specimens of lei-gong-mo (tektites) were collected from Hainan Island and Leizhow Peninsula during the period from 1963 to 1975. The distribution, forms, sculpture, abration surface (bald spot), internal structure and chemical composition of lei-gong-mo are discussed. Studies of these materials lead to the following conclusions: (1) the specimens of lei-gong-mo can be morphologically divided into eight types; (2) the sculptures on the surface of lei-gong-mo are probably due to the corrosion effect of volcanic gas, and the abration surface due to the aerodynamic corrosion; (3) the folded structures in the layered lei-gong-mo (Muong Nong-type tektite) seem hardly to be formed by an impact of meteorites, but they might be produced in the magma flow process when the lei-gong-mo was melting within the crater vent; and (4) the comparison of its chemical composition with that of basalt from Hainan Island does not show that lei-gong-mo came from the local volcano. The hypothesis of the lunar volcanic origin of tektites is examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77328 , NAS 1.15:77328
    Format: application/pdf
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  • 9
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    Reconstruction of the H2O profile from the results of modeling the heat flux in the lower atmosphere of Venus (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The H2O profile in the Venus lower atmosphere is reconstructed by the effective radiation flux data. It is shown that the H2O vapor abundance is concentrated mainly in the 20 to 48 km layer and depends on measurement time and location. The magnitudes of H2O optically determined are much less than those obtained by probing, especially below 20 km.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77216 , NAS 1.15:77216 , PREPRINT-164
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    The study of Venus continues (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The landing of the Soviet interplanetary station Venera-13 in March, 1982, is described. One of the tasks of the station was to study the composition and structure of cloud layers on Venus. It was established that the cloud layer consists largely of sulfuric acid. Data obtained from other Venera stations are also presented. It is concluded that fundamental similarities can be found in the geological development of the Earth and Venus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-77198 , NAS 1.15:77198
    Format: application/pdf
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