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  • Other Sources  (16)
  • SPACE SCIENCES  (16)
  • 1970-1974  (16)
  • 1
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    Comet Bennett 1970 II. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The model for dust comets, formulated by Finson and Probstein, which had previously been tested only on Comet Arend-Roland 1957 III, has been successfully applied to three calibrated photographic plates of Comet Bennett. The size distribution, emission rate, and initial velocities of dust particles emitted from the comet's nucleus are given.
    Keywords: SPACE SCIENCES
    Type: Science; 179; Feb. 9
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Theoretical interpretation of the Venus 1.05-micron CO2 band and the Venus 0.8189-micron H2O line. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The synthetic-spectrum technique was used in the analysis. The synthetic spectra were constructed with a model which takes into account both isotropic scattering and the inhomogeneity in the Venus atmosphere. The Potter-Hansen correction factor was used to correct for anisotropic scattering. The synthetic spectra obtained are, therefore, the first which contain all the essential physics of line formation. The results confirm Potter's conclusion that the Venus cloud tops resemble terrestrial cirrus or stratus clouds in their scattering properties.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 173; May 1
    Format: text
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  • 3
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    Some implications of satellite spin effects in cylindrical probe measurements (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: In-situ measurements of ambient electron densities with satellite-borne cylindrical probes exhibit periodic variations synchronous with the satellite's spin cycle. Representing these fluctuations as a superposition of effects attributable to both the presence of the satellite wake and the geomagnetic field leads to a model of the modulations of accelerated electron current to cylindrical probes in which one modulation component displays current variations dependent upon the probe-velocity angle (psi) and the other displays variations dependent upon the angle between the probe axis and the geomagnetic field lines (beta). The modulations produce an electron current decrease whenever the probe axis rotates into the satellite wake or whenever the probe axis rotates toward alignment with the geomagnetic field lines. With increasing altitude, the modulation dependent upon psi decreases whereas the modulation dependent upon beta increases. The analysis results imply that the most accurate of atmospheric electron densities by satellite-borne cylindrical probes come from measurements taken out of the satellite's wake and when the probe axis is within 20 degrees of being perpendicular to the geomagnetic field lines.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65803 , X-621-71-446
    Format: application/pdf
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  • 4
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    Isotopic compositions of rare gases in the carbonaceous chondrites Mokoia and Allende. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The isotopic compositions have been measured mass spectrometrically for neon, argon, krypton and xenon released from the carbonaceous chondrites Mokoia and Allende in stepwise heating experiments. The isotopic compositions of rare gases released from the meteorites at different temperatures varied quite considerably. A marked enrichment of Xe129 due to the decay of extinct nuclide I129 was observed in both meteorites. The variations of the isotopic ratios are partly caused by the presence of cosmic-ray spallation and neutron-capture products. In addition, however, a marked trend of mass-dependent variation of the isotopic ratios was observed in this work. The rare gas isotopes released from the meteorites appear to be systematically mass-fractionated relative to the relative abundances of the average carbonaceous chondrite. It seems that this phenomenon can be best explained as due to the fact that there exist reservoirs of two isotopically distinct gases in the meteorites and mixtures of these gases are being released at each temperature fraction.
    Keywords: SPACE SCIENCES
    Type: Geochimica et Cosmochimica Acta; 36; Sept
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  • 5
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    Carbon dioxide clathrate in the Martian ice cap (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Carbon dioxide clathrate in Martian ice cap suggested from hydrate stability relative to solid phase and water ice as function of temperature
    Keywords: SPACE SCIENCES
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  • 6
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    Factors affecting frequency and orbit utilization by high power transmission satellite systems. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The factors affecting the sharing of the geostationary orbit by high power (primarily television) satellite systems having the same or adjacent coverage areas and by satellites occupying the same orbit segment are examined and examples using the results of computer computations are given. The factors considered include: required protection ratio, receiver antenna patterns, relative transmitter power, transmitter antenna patterns, satellite grouping, and coverage pattern overlap. The results presented indicate the limits of system characteristics and orbit deployment which can result from mixing systems.
    Keywords: SPACE SCIENCES
    Type: NATO, AGARD, Avionics Meeting on Aerospace Telecommunications Systems; May 15, 1972 - May 19, 1972; London
    Format: text
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  • 7
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    An expanded theoretical interpretation of the Venus 1.05-micron CO2 line and the Venus 0.8226-micron H2O line. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 185; Oct. 1
    Format: text
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  • 8
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    Does spectroscopic evidence require two scattering layers in the Venus atmosphere. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Comments on Hunt's (1972) conclusion that the phase variation of lines in the 7820- and 7883-A CO2 bands is due to the presence of two scattering layers in the Venusian atmosphere. It is shown that the increase of equivalent width with phase between 0 and 90 deg noted by Hunt in the data by Gray Young et al. (1971) does not necessarily require a two-layer model of scattering in the Venusian atmosphere and that this increase may be due to the strong backward lobe in the Venusian cloud phase function. Hunt, in a reply, notes that Regas et al. incorrectly use in their analysis Hansen's (1969) data which are for a homogeneous planetary atmosphere, while Hunt used an inhomogeneous model of the Venusian atmosphere. In addition, further evidence to support Hunt's claim for a multilayered structure of the upper Venusian clouds is presented.
    Keywords: SPACE SCIENCES
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 13; May 1973
    Format: text
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  • 9
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    Elemental abundances in the Havero meteorite. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Abundances of 15 major, minor, and trace elements have been determined in powders and interior chips derived from the Havero ureilite. The values are in close agreement with mean values for other ureilites, as reported in the literature. The powdered samples exhibited slightly higher abundances of O and Si than the interior chips. It is suggested that this may be due to alteration of the samples during the powdering process.
    Keywords: SPACE SCIENCES
    Type: Meteoritics; 7; Dec. 30
    Format: text
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  • 10
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    Redshifts of a BSO and galaxies in the vicinity of the radio source RN 8. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 179; Jan. 15
    Format: text
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