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  • GEOPHYSICS  (1,191)
  • ASTROPHYSICS  (502)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE
  • 1975-1979  (977)
  • 1970-1974  (868)
Collection
Keywords
Years
Year
  • 1
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    Studies in the Lake Ontario Basin using ERTS-1 and high altitude data (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Studies in the Lake Ontario Basin are designed to provide input for models of river basin discharge and macro-scale features of lake circulation. Lake studies appear to require high altitude imagery to record the dynamic features of Lake Ontario so that ERTS-1 data may be interpreted. Land area studies require input of soil moisture, land use and soil-sediment-geomorphology measurements some of which appear to be available, on a regional scale from ERTS-1 products.
    Keywords: GEOPHYSICS
    Type: PAPER-W14 , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 819-828
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Satellite studies of the stratospheric aerosol (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The potential climatological and environmental importance of the stratospheric aerosol layer has prompted interest in measuring the properties of this aerosol. This paper reports on two recently deployed NASA satellite systems (SAM II and SAGE) that are monitoring the stratospheric aerosol. The satellite orbits obtain nearly global coverage. The instruments mounted in the spacecraft are sun photometers that measure solar intensity at specific wavelengths as it is moderated by atmospheric particulates and gases during each sunrise and sunset encountered by the satellites. Latitudinal, longitudinal, and temporal variations in the aerosol layer are evaluated. The satellite systems are being validated by a series of ground truth experiments using airborne and ground lidar, balloon-borne dustsondes, aircraft-mounted impactors, and other correlative sensors. The SAM II and SAGE satellite systems, instrument characteristics, and mode of operation are described; the methodology of the experiments is outlined; and the ground truth experiments are discussed. Preliminary results from these measurements are presented.
    Keywords: GEOPHYSICS
    Type: American Meteorological Society; vol. 60
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The analysis of various size, visually selected and density and magnetically separated fractions of Luna 16 and 20 samples (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Samples of Luna 16 and 20 have been separated according to size, visual appearance, density, and magnetic susceptibility. Selected aliquots were examined in eight British laboratories. The studies included mineralogy and petrology, selenochronology, magnetic characteristics, Mossbauer spectroscopy, oxygen isotope ratio determinations, cosmic ray track and thermoluminescence investigations, and carbon chemistry measurements. Luna 16 and 20 are typically mare and highland soils, comparing well with their Apollo counterparts, Apollo 11 and 16, respectively. Both soils are very mature (high free iron, carbide, and methane and cosmogenic Ar), while Luna 16, but not Luna 20, is characterized by a high content of glassy materials. An aliquot of anorthosite fragments, handpicked from Luna 20, had a gas retention age of about 4.3 plus or minus 0.1 Gy.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington the Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 703-727
    Format: application/pdf
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  • 4
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    Advanced development of atmospheric models (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A set of atmospheric analysis and prediction models was developed in support of the SEASAT Program existing objective analysis models which utilize a 125x125 polar stereographic grid of the Northern Hemisphere, which were modified in order to incorporate and assess the impact of (real or simulated) satellite data in the analysis of a two-day meteorological scenario in January 1979. Program/procedural changes included: (1) a provision to utilize winds in the sea level pressure and multi-level height analyses (1000-100 MBS); (2) The capability to perform a pre-analysis at two control levels (1000 MBS and 250 MBS); (3) a greater degree of wind- and mass-field coupling, especially at these controls levels; (4) an improved facility to bogus the analyses based on results of the preanalysis; and (5) a provision to utilize (SIRS) satellite thickness values and cloud motion vectors in the multi-level height analysis.
    Keywords: GEOPHYSICS
    Type: NASA-CR-166630
    Format: application/pdf
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  • 5
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    Laser transit-time measurements between the earth and the moon with a transportable system. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Science; 180; June 1
    Format: text
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  • 6
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    Tri- and tetraterpenoid hydrocarbons in the Messel oil shale (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The high-molecular-weight constituents of the branched and cyclic hydrocarbon fraction of the Messel oil shale (Eocene) have been examined by high-resolution gas chromatography and combined gas chromatography/mass spectrometry. The following compounds are present: perhydrolycopene, together with one or more unsaturated analogs with the same skeleton; a series of 4-methylsteranes in higher abundance than their 4-desmethyl analogs; two series of pentacyclic triterpanes, one series based on the hopane structure, and the other based on the 17 alpha-H hopane structure; and an intact triterpene hop-17(21)-ene. Only two additional triterpanes were detected in minor concentrations - namely, 30-normoretane and a C31 triterpane based on the hopane/lupane-type skeleton. The presence of these compounds suggests a significant microbial contribution to the forming sediment.
    Keywords: GEOPHYSICS
    Type: Geochimica et Cosmochimica Acta; 38; July 197
    Format: text
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  • 7
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    SAM-2 ground-truth plan: Correlative measurements for the Stratospheric Aerosol Measurement-2 (SAM 2) sensor on the Nimbus G satellite (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The SAM-2 will fly aboard the Nimbus-G satellite for launch in the fall of 1978 and measure stratospheric vertical profiles of aerosol extinction in high latitude bands. The plan gives details of the location and times for the simultaneous satellite/correlative measurements for the nominal launch time, the rationale and choice of the correlative sensors, their characteristics and expected accuracies, and the conversion of their data to extinction profiles. The SAM-2 expected instrument performance and data inversion results are presented. Various atmospheric models representative of polar stratospheric aerosols are used in the SAM-2 and correlative sensor analyses.
    Keywords: GEOPHYSICS
    Type: NASA-TM-78747
    Format: application/pdf
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  • 8
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    Evidence for a supermassive object in the nucleus of the galaxy M87 from SIT and CCD area photometry (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for broadband three-color (BVR) photometric observations of the peculiar elliptical radio galaxy M87, which were obtained with digital two-dimensional SIT and CCD detector systems on the Palomar 60-in. and 200-in. telescopes. The observations and the reduction procedures for the digital data are outlined, the luminosity profile of M87 is given, and a nuclear luminosity spike is found to be centered within 0.02 arcsec of the center of M87. Attempts are made to fit various theoretical models to the luminosity profile, and a satisfactory fit is obtained between the observed profile and a model involving a massive black hole in the galactic nucleus. A model-independent dynamical analysis of the central regions is performed which indicates that the nucleus of M87 contains a supermassive object of about 5 billion solar masses with a radius of no more than 100 pc and an M/L ratio of at least 60. The possible nature of this object is considered, and it is concluded that M87 is probably the most plausible candidate for a massive black hole in a galactic nucleus.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 221
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Detection of southern corn leaf blight by remote sensing techniques. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Multispectral photographic and scanner data were collected over western Indiana in August and September 1970, to determine the detectability of southern corn leaf blight by remote sensing. Measurements were made at altitudes of 3000 to 7000 ft. Color, color IR, and multiband black and white photography were collected at altitudes from 3000 to 60,000 ft. Six levels of infection based on the amount of leaf damage were identified in the fields. Three levels of infection were detected with color IR photography by standard photo-interpretive techniques. Up to five levels of infection were distinguished by applying automatic pattern recognition techniques to the multispectral scanner data. The results illustrate the potential of remote sensing techniques in the detection of crop diseases.
    Keywords: GEOPHYSICS
    Type: International Symposium on Remote Sensing of Environment, 7th, University of Michigan; May 17, 1971 - May 21, 1971; Ann Arbor, MI
    Format: text
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  • 10
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    Structure of the thermosphere as inferred from incoherent scatter measurements. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: GEOPHYSICS
    Type: Plenary Meeting on Space research XII; Jun 18, 1971 - Jul 02, 1971; Seattle, WA
    Format: text
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