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  • SPACE SCIENCES  (401)
  • 2020-2023
  • 2010-2014
  • 1970-1974  (401)
  • 1965-1969
  • 1935-1939
  • 2020
  • 1972  (401)
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  • 2020-2023
  • 2010-2014
  • 1970-1974  (401)
  • 1965-1969
  • 1935-1939
Year
  • 11
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    The detection and mapping of water vapor in the Martian atmosphere. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The objectives of the water vapor investigations, to be carried out during the Viking missions, are described in the light of our current knowledge of Martian atmospheric conditions and the diurnal and seasonal variations of the water abundance. A discussion is given of the relative merits of the different experimental approaches which can be adopted for this purpose, followed by a summary of the detection limits achievable in the available spectral regions. These considerations led to the choice of a spectrometer operating in the 1.4-micron region, with a spectral resolution of approximately one wavenumber and a surface spatial resolution at periapsis of 3 by 24 km. The design of the spectrometer and the results of laboratory simulation tests which have been carried out to verify the expected instrumental performance are described.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Feb. 197
    Format: text
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  • 12
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    Radio science experiments - The Viking Mars Orbiter and Lander. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The objective of the radio science investigations is to extract the maximum scientific information from the data provided by the radio and radar systems on the Viking Orbiters and Landers. Unique features of the Viking missions include tracking of the landers on the surface of Mars, dual-frequency S- and X-band tracking data from the orbiters, lander-to-orbiter communications system data, and lander radar data, all of which provide sources of information for a number of scientific investigations. Post-flight analyses will provide both new and improved scientific information on physical and surface properties of Mars, on atmospheric and ionospheric properties of Mars, and on solar system properties.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Feb. 197
    Format: text
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  • 13
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    Xenon in carbonaceous chondrites. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A table showing the relative amounts of xenon isotopes in carbonaceous chondrites is presented. It is found that the enrichment of heavy xenon isotopes released from carbonaceous chondrites in the approximate temperature range from 600 to 1000 C is accompanied by an enrichment of the light xenon isotopes. The high degree of correlation between these two isotopic anomalies suggests that both result from a common source. There is no known nuclear or physical process which could produce both anomalies in situ. It is, therefore, suggested that the anomalies are the result of the release of isotopically anomalous xenon which was trapped in the meteorites.
    Keywords: SPACE SCIENCES
    Type: Nature Physical Science; 240; Dec. 4
    Format: text
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  • 14
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    Transfer of resonance-line radiation in differentially expanding atmospheres. II - Analytic solution for the case of coherence in the frame of the fluid. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Derivation of an exact solution for the problem of line transfer by resonant scattering (assumed coherent in the fluid frame) in a differentially expanding atmosphere. The probabilistic method developed is a generalization of the method of addition of layers plus a decomposition of the radiation field into partial radiation fields due to those photons that scatter exactly n times before escaping (n = 0, 1, 2, 3,
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 176; Sept. 1
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  • 15
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    Transfer of resonance-line radiation in differentially expanding atmospheres. I - General considerations and Monte Carlo calculations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A Monte Carlo method is given for analyzing the transfer of resonance radiation in a rapidly and differentially expanding nebula. Coherence in the frame of the atom is shown to lead to interesting modifications of the emergent radiation field, as compared with the other more usual assumptions of coherence or redistribution in the fluid frame. Results are presented in tabular form suitable for further use. Sample line profiles produced by pure scattering out of the continuum are generated, and it is shown that an arbitrarily high peak can be obtained. This conclusion is independent of the coherence assumption used. The distribution of the number of scatterings is found in all cases. An analytic solution is presented for the case of coherence in the fluid frame.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 176; Sept. 1
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  • 16
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    Preliminary Mariner 9 report on the geology of Mars. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Mariner 9 results indicate that Mars is geologically far more heterogeneous than previously suspected from earlier flyby missions; the surface has been shaped by volcanic, tectonic, erosional, and depositional activity. The equatorial region between 30 deg N and 30 deg S latitude is depicted in four geologic sketch maps, and seventeen geologic units are defined on the basis of their textural characteristics. The maps and the brief descriptions of geological units portrayed are followed by a series of more interpretive discussions dealing with topical problems and a summary geologic history. Topics covered include cratering, circular basins, volcanism, canyons, chaotic terrain, channels, and eolian activity.
    Keywords: SPACE SCIENCES
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  • 17
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    Evidence for the 300-second oscillation from OSO-7 extreme-ultraviolet observations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The detection and significance of 300-second oscillations in extreme-ultraviolet lines formed in the solar transition region are discussed. Detection was accomplished with the Goddard extreme-ultraviolet spectroheliograph and the Wolter type II grazing-incidence telescope. The Cooley-Tukey algorithm was used to compute the required Fourier transform of the discrete data. Presence of significant power in the observed lines around 262 sec seems to be the first observational evidence that periodic waves in this frequency range persist at heights where local kinetic temperatures are close to one million degrees K. The observed horizontal extent of the wave fronts appears to be much greater than the extent of coherent oscillating elements at chromospheric heights. Several implications are stated for the problem of heating of the transition region and low corona.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 174; June 1
    Format: text
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  • 18
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    An unusual absorption feature in the far-ultraviolet spectrum of early-type supergiants. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The OAO-II satellite has been used to obtain far-UV scans of six early-type supergiants. The data reveal the presence of a distinct, broad absorption feature centered near 1720 A. This feature is unique in that it remains essentially constant in strength, breadth, and central position over the spectral type range BO I to A2 I. The feature also appears in the spectrum of the B-type shell star zeta Tau, with a strength comparable to that observed for the supergiants. It appears weakly, or not at all, in the B and A main-sequence spectra examined. The presence of the feature in spectra of supergiants and a shell star supports the hypothesis that it is an extended-envelope phenomenon.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 171; Jan. 1
    Format: text
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  • 19
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    An unusual absorption feature in the far ultraviolet spectrum of early type supergiants (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The OAO-2 satellite has been used to obtain far ultraviolet scans of six early-type supergiants. The data reveal the presence of a distinct, broad absorption feature centered near 1720 A. This feature is unique in that it remains essentially constant in strength, breadth and central position over the spectral type range B0 I to A2 I. The feature also appears in the spectrum of the B-type shell star beta Tauri, with a strength comparable to that observed for the supergiants. It appears weakly, or not at all, in the B and A main sequence spectra we have examined. The hypothesis that the feature is due to a fortuitous blend of intrinsically strong lines arising primarily from the ground configurations of abundant metallic ions is discussed in detail.
    Keywords: SPACE SCIENCES
    Type: The Sci. Results from the Orbiting Astron. Obs. (OAO-2); p 393-404
    Format: application/pdf
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  • 20
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    The last Balmer line and H gamma in model B stars (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Profiles of the last few Balmer lines (H12-H27) and the full profiles of the H gamma line were computed for a grid of hydrogen line blanketed model atmospheres. The use of the last hydrogen line and the equivalent width of H gamma provide a quick means of estimating the effective temperature and surface gravity of B stars. Regression curves relating the quantum number of the last hydrogen line to the electron density in the model atmosphere are given. Futhermore, it is shown that the difference in the gravity determination deduced from H gamma equivalent widths using the Edmonds-Schuter-Wells formalism and the Griem wing formulae is, at worst, 0.18 in the common logarithm.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-66266 , X-671-72-437
    Format: application/pdf
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