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  • LUNAR AND PLANETARY EXPLORATION  (150)
  • GEOPHYSICS  (109)
  • ASTROPHYSICS  (74)
  • 1975-1979  (333)
  • 1978  (333)
  • 1972
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  • 1
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    Martian atmosphere modeling between 0.4 and 3.5 microns - Comparison of theory and experiment (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A model of the lower atmosphere of Mars has been constructed that combines aerosol absorption and scattering with a line-by-line analysis of CO2 and H2O in a multilayer radiative transfer program. Aerosol composition previously inferred from the NASA Lear Jet Observatory data was used to measure the optical complex indices of refraction of appropriate Martian analogs from 0.4 to 2.5 microns. The aerosol vertical particle density scale was deduced using the Viking camera observations of the soil and sky intensities between 0.4 and 1.0 microns in comparison with those modeled using a multilayer Mie scattering program. A comparison of observed Mars atmospheric absorptions was made with those obtained using Lorentz, Voigt, and Doppler line profiles in a multilayer model of the CO2 and H2O. The Voigt line profile of CO2 absorption at approximately 4976 kaysers was then combined in a multilayer aerosol model of the Martian atmosphere. An evaluation of the effect on the line shape was made using several aerosol loadings.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: In: Symposium on Planetary Atmospheres; Aug 16, 1977 - Aug 19, 1977; Ottawa; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The radii of Uranian rings alpha, beta, gamma, delta, epsilon, eta, 4, 5, and 6 from their occultations of SAO 158687 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: All available timing data for the occultations of SAO 158687 on March 10, 1977, by the cited rings of Uranus are analyzed. Least-squares fits to the data are performed using a model which postulates that rings alpha, beta, gamma, and delta are circular and coplanar. A solution obtained under the assumption that the ring plane coincides with the plane of the satellite orbits is adopted which yields radii of 44,844 km for ring alpha, 45,799 km for ring beta, 47,746 km for ring gamma, and 48,423 km for ring delta. The uncertainties in these values are discussed along with the apparent shapes and inclinations of these main rings. The mean radii estimated for the other rings are: 47,323 km for ring eta, 42,663 km for ring 4, 42,360 km for ring 5, and 41,980 km for ring 6.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomical Journal; 83; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Plasma flow pulsations in earth's magnetic tail (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: On November 9, 1972 Imp 7 was in the plasma sheet from 0430 to 1000 UT and detected strong earthward plasma flows. A series of nine temporal pulsations were observed to vary in bulk speed from 0 to about 1500 km/s and to occur at 15-30 minute intervals. A positive correlation exists between the speed variations and changes in the standard deviation of the magnetic field. Evident periodicity was not found corresponding to Imp 7 pulsations and other magnetospheric or solar wind data. It is felt that the pulsations may indicate that tail reconnection is unsteady in periods of 10-30 minutes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Earth Radiation Budget (ERB) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The radiation budget of the earth on both synoptic and planetary scales by simultaneous measurement of incoming solar radiation and outgoing earth reflected (shortwave) and emitted (longwave) radiation was determined. Both fixed wide angle sampling of terrestrial fluxes at the satellite altitude, and scanned narrow-angle sampling of the radiance components, dependent on angle are used to determine outgoing radiation. Measurements of radiation are obtained in 22 different optical channels.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 33-58
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    NASA TECHNICAL REPORTS
  • 5
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    Stratospheric Aerosol Measurement (SAM 2) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The Stratospheric Aerosol Measurement 2 (SAM 2) is used to map the concentration and optical properties of stratospheric aerosols as a function of altitude, latitude, and longitude. The vertical distribution of the stratospheric aerosols in the polar regions of both hemispheres is provided.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 105-138
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Conclusions derived from the evidence on accretion in meteorites (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A study of the evidence on accretion in meteorites shows that gross chemical features of chondritic meteorite type were established by accretion of materials with characteristic chemical and isotopic compositions. Some meteorites have been subjected to intensive mechanical and/or thermal processes. Mixing has occurred among meteorite types, presumably late in the accretion sequence. From the materials which appear to have escaped substantial modification it can be concluded that the relative velocities between accreting grains varied but in some cases were very low. Accretion took place after most, if not all, of the gaseous components had been separated from the condensed portion of solar matter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Electrical structure and ionizable constituent measurements (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: In-situ stratospheric ions showed typical characteristics. A Krypton lamp created large numbers of additional ions of remarkably high mobility with a product of number density and ionization cross section of the ionizable constituent(s) greater than 10 cm to the 9th power per cm.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center STRATCOM 8 Data Workshop and Suppl.; p 103-108
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Electrical conductivity measurements from the STRATCOM 8 experiment (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A blunt probe experiment for measuring electrical conductivity was flown with the STRATCOM 8 instrument package. Data were obtained by the instrument throughout the entire measurement period. A preliminary analysis of the data indicates an enhancement in conductivity associated with the krypton discharge ionization lamp, particularly in negative conductivity. The conductivity values and their altitude dependence are consistent with previous balloon and rocket results.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center STRATCOM 8 Data Workshop and Suppl.; p 96-102
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Crustal evolution inferred from Apollo magnetic measurements (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Magnetic field and solar wind plasma density measurements were analyzed to determine the scale size characteristics of remanent fields at the Apollo 12, 15, and 16 landing sites. Theoretical model calculations of the field-plasma interaction, involving diffusion of the remanent field into the solar plasma, were compared to the data. The information provided by all these experiments shows that remanent fields over most of the lunar surface are characterized by spatial variations as small as a few kilometers. Large regions (50 to 100 km) of the lunar crust were probably uniformly magnetized during early crustal evolution. Bombardment and subsequent gardening of the upper layers of these magnetized regions left randomly oriented, smaller scale (5 to 10 km) magnetic sources close to the surface. The larger scale size fields of magnitude approximately 0.1 gammas are measured by the orbiting subsatellite experiments and the small scale sized remanent fields of magnitude approximately 100 gammas are measured by the surface experiments.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-78524 , A-7608
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Infrared observations of asteroids from earth and space (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Infrared reflectances at wavelength between 1 and 4 micrometers are used for determining asteroid surface mineralogy, surface composition, diameters, and albedos. Thermal models were developed for analyzing infrared observations at longer wavelengths. The discovery of a spectral feature due to water of hydration on Ceres seems to contradict the mineralogy inferred from spectrophotometry.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Asteroids; p 127-144
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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