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  • LUNAR AND PLANETARY EXPLORATION  (6)
  • 1985-1989  (6)
  • 1955-1959
  • 1935-1939
  • 1915-1919
  • 1988  (2)
  • 1987  (4)
  • 1959
  • 1956
  • 1935
  • 1917
  • 1916
Collection
Keywords
Years
  • 1985-1989  (6)
  • 1955-1959
  • 1935-1939
  • 1915-1919
Year
  • 1
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    Radio-interferometric imaging of the subsurface emissions from the planet Mercury (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The distribution of total and polarized intensities from Mercury's subsurface layers have been mapped using VLA observations. The first detection of a hot pole along the Hermean equator is reported and modeled as black-body reradiation from preferential diurnal heating. These observations appear to rule out any internal sources of heat within Mercury. Polarized emission from the limb of the planet is also found, and is understood in terms of the dielectric properties of the Hermean surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 329; 224-226
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Fluvial valleys on Martian volcanoes (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Channels and valleys were known on the Martian volcanoes since their discovery by the Mariner 9 mission. Their analysis has generally centered on interpretation of possible origins by fluvial, lava, or viscous flows. The possible fluvial dissection of Martian volcanoes has received scant attention in comparison to that afforded outflow, runoff, and fretted channels. Photointerpretative, mapping, and morphometric studies of three Martian volcanoes were initiated: Ceraunius Tholus, Hecate Tholus, and Alba Patera. Preliminary morphometric results indicate that, for these three volcanoes, valley junction angles increase with decreasing slope. Drainage densities are quite variable, apparently reflecting complex interactions in the landscape-forming factors described. Ages of the Martian volcanoes were recently reinterpreted. This refined dating provides a time sequence in which to evaluate the degradational forms. An anomaly has appeared from the initial study: fluvial valleys seem to be present on some Martian volcanoes, but not on others of the same age. Volcanic surfaces characterized only by high permeability lava flows may have persisted without fluvial dissection.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 294-296
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The channels of Mars (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The geomorphology of Mars is discussed, focusing on the Martian channels. The great flood channels of Mars, the processes of channel erosion, and dendritic channel networks, are examined. The topography of the Channeled Scabland region of the northwestern U.S. is described and compared to the Martian channels. The importance of water in the evolution of the channel systems is considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: AAS PAPER 86-156
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The magnetosphere of Mercury (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Data provided by the Mariner-10 spacecraft on the properties of Mercurian magnetosphere are examined. These observations indicate that the Mercurian magnetosphere has a magnetopause and a bow shock which are quite similar to their terrestrial counterparts, although much smaller. However, due to the absence of any significant atmosphere or ionosphere, the flow of current in the Mercurian magnetosphere is different from the patterns at the earth. Many questions regarding the intrinsic magnetic field properties of Mercury remain unanswered, such as the existence of radiation belts, magnetic storms, the size of auroral regions, the mechanism of global magnetospheric convection, and the source of plasma.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    MECA Symposium on Mars: Evolution of its Climate and Atmosphere (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The geological, atmospheric, and climatic history of Mars is explored in reviews and reports of recent observational and interpretive investigations. Topics addressed include evidence for a warm wet climate on early Mars, volatiles on Earth and on Mars, CO2 adsorption on palagonite and its implications for Martian regolith partitioning, and the effect of spatial resolution on interpretations of Martian subsurface volatiles. Consideration is given to high resolution observations of rampart craters, ring furrows in highland terrains, the interannual variability of the south polar cap, telescopic observations of the north polar cap and circumpolar clouds, and dynamical modeling of a planetary wave polar warming mechanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-182872 , NAS 1.26:182872 , LPI-TR-87-01 , Jul 17, 1986 - Jul 19, 1986; Washington, DC; United States
    Format: application/pdf
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  • 6
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    Zonal winds near Venus' cloud top level - A model study of the interaction between the zonal mean circulation and the semidiurnal tide (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Holton (1982) wave-mean flow interaction model's primitive equation is presently adapted in order to clarify the interaction between the semidiurnal tide and the thermally driven mean meridional circulation near cloud top level. The model is found to produce midlatitude jets whose structure is insensitive to vertical shear of the background angular velocity, both above and below cloud top level; a sensitivity to background angular velocity at cloud top level, however, is noted. Agreement between the model tide and either the observed one or that generated by the more detailed calculations of Pechmann and Ingersoll (1984) is found to be greatest when the background angular velocity at the jet level is of the order of 30 percent larger than that which is observed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 69; 202-220
    Format: text
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    NASA TECHNICAL REPORTS
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