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  • GEOPHYSICS  (123)
  • ENERGY PRODUCTION AND CONVERSION  (91)
  • AERODYNAMICS  (85)
  • ASTRONOMY  (56)
  • SPACE RADIATION  (44)
  • 1990-1994
  • 1980-1984
  • 1975-1979  (399)
  • 1970-1974
  • 1955-1959
  • 1978  (399)
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  • 1990-1994
  • 1980-1984
  • 1975-1979  (399)
  • 1970-1974
  • 1955-1959
Year
  • 1
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    The ISEE-C gamma ray burst spectrometer (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The technical properties, operation, and expected sensitivity are discussed for an experiment intended to search for narrow lines in the spectra of gamma ray bursts during the ISEE-C mission. At the heart of the experiment is a radiatively cooled germanium solid state photon detector. The instrumentation is capable of storing the entire spectrum of all but the largest bursts in the energy range 0.05-6.5 MeV. In addition, it analyzes the signals from two CsI detectors in two other experiments on the spacecraft and records event time histories from these to a few millisecond accuracy. A background mode permits spectral analysis during quiet times and will allow the determination of physically interesting upper limits for narrow lines in the diffuse gamma ray background radiation.
    Keywords: SPACE RADIATION
    Type: Gamma Ray Spectry. in Astrophys.; p 516-528
    Format: text
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  • 2
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    Observations of medium-energy gamma-ray emission from the galactic center region (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Measurements of the gamma-ray emission in the medium-energy range between 15 and 100 MeV, obtained during two balloon flights from Brazil, are presented. The importance of this energy region in determining whether neutral-pion decay or electron bremsstrahlung is the most likely dominant source mechanism is discussed, along with the implications of such observations. Specifically, the data from this experiment suggest that emission from the galactic plane is similar to the theoretical spectrum calculated by Fichtel et al. (1976), including both source mechanisms but with the bremsstrahlung component enhanced by a factor of about 2. A spectral distribution of gamma-rays produced in the residual atmosphere above the instrument is also presented and compared with other data. A rather smooth spectral variation from high to low energies is found for the atmospheric spectrum.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; vol. 225
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  • 3
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    Observations of medium energy gamma ray emission from the galactic center region (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Measurements of the gamma-ray emission in the medium energy range between 15 and 100 MeV, obtained during two ballon flights from Brazil are presented. The importance of this energy region in determining whether pi deg - decay of electron bremsstrahlung is the most likely dominant source mechanism is discussed along with the implications of such observations. Specifically, the data from this experiment suggest that emission from the galactic plane is similar to theoretical spectrum calculations including both sources mechanisms, but with the bremsstrahlung component enhanced by a factor of about 2. A spectral distribution of gamma-rays produced in the residual atmosphere above the instrument is also presented and compared with other data. A rather smooth spectral variation from high to low energies is found for the atmospheric spectrum.
    Keywords: SPACE RADIATION
    Type: NASA-TM-79543
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  • 4
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    Dual membrane hollow fiber fuel cell and method of operating same (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A gaseous fuel cell is described which includes a pair of electrodes formed by open-ended, ion-exchange hollow fibers, each having a layer of metal catalyst deposited on the inner surface and large surface area current collectors such as braided metal mesh in contact with the metal catalyst layer. A fuel cell results when the electrodes are immersed in electrolytes and electrically connected. As hydrogen and oxygen flow through the bore of the fibers, oxidation and reduction reactions develop an electrical potential. Since the hollow fiber configuration provides large electrode area per unit volume and intimate contact between fuel and oxidizer at the interface, and due to the low internal resistance of the electrolyte, high power densities can be obtained.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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  • 5
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    An analysis of the first two years of GASP data (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Distributions of mean ozone levels from the first two years of data from the NASA Global Atmospheric Sampling Program (GASP) show spatial and temporal variations in agreement with previous measurements. The standard deviations of these distributions reflect the large natural variability of ozone levels in the altitude range of the GASP measurements. Monthly mean levels of ozone below the tropopause show an annual cycle with a spring maximum which is believed to result from transport from the stratosphere. Correlations of ozone with independent meteorological parameters, and meteorological parameters obtained by the GASP systems show that this transport occurs primarily through cyclogenesis at mid-latitudes. The GASP water vapor data, analyzed with respect to the location of the tropopause, correlates well with the simultaneously obtained ozone and cloud data.
    Keywords: GEOPHYSICS
    Type: In: Joint Conference on Sensing of Environmental Pollutants; Nov 06, 1977 - Nov 11, 1977; New Orleans, LA
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  • 6
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    Energy spectrum of medium energy gamma-rays from the galactic center region (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A balloon-borne magnetic core digitized spark chamber with two assemblies of spark-chambers above and below the scintillation counters was used to measure the medium energy gamma ray flux from the galactic center region. Gamma ray calculations are based on the multiple scattering of the pair electrons in 15 aluminum plates interleaved in the spark chamber modules. Counting rates determined during ascent and at ceiling indicate the presence of diffuse component in this energy range. Preliminary results give an integral flux between 15 and 70 MeV compared to the differential points in other results.
    Keywords: SPACE RADIATION
    Type: NASA-TM-78331 , INPE-1218-PE/122
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  • 7
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    Detached auroral arcs in the trough region (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: In a previous paper, Moshupi et al. (1977) have reported on the occurrence of rare auroral 'patches' equatorward of the normally well-defined boundary of diffuse aurora. Some less spectacular but more common arclike features were observed in the same 'trough' region (between the plasmapause and the auroral oval) during the period 1972-1975. These 'detached' arcs show some similarities to stable auroral red arcs in terms of their location and occurrence, but are completely different spectroscopically in that the stable auroral red arcs produce almost pure atomic oxygen red line emissions, whereas the detached arcs are deficient in red line emission - a feature implying totally different production mechanisms. The characteristics of the detached lines are described, including their unusual local time/longitude dependence.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; June 1
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  • 8
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    1 millimeter continuum observations of extragalactic objects (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Continuum observations of 23 extragalactic objects have been made at a wavelength of 1 mm; nine of the 23 have been definitely detected at this wavelength. The sources detected include seven from which the 1-mm emission appears to be nonthermal, and two from which the emission appears to be thermal radiation from dust. Repeated observations of the brightest nonthermal sources permitted a search for 1-mm variations on time scales of one month to three years. BL Lac was observed to vary by more than a factor of 2 in flux, and 3C 84, 3C 120, and 3C 273 showed possible variations; 3C 279 showed no variations greater than + or - 30%. The 1-mm variations of BL Lac appear to be correlated with variations at radio wavelengths. The other sources with nonthermal spectra detected were 3C 111 and M87; the two thermal sources detected were NGC 253 and M82. Comparison of the latter two 1-mm measurements with 2.6-mm CO measurements suggests that the CO line in these galaxies is not heavily saturated.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 220
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  • 9
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    The Stratospheric and Mesospheric Sounder (SAMS) experiment (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Thermal emission and solar resonance fluorescence from the atmospheric limb are reported. Global measurements are made of radiation from the molecular species. The gas correlation spectroscopy technique based on the use of gas cells to select emission from chosen spectral lines or from particular parts of spectral lines is used. The source function and departure from the thermodynamic equilibrium between 80 and 130 kilometers associated with CO2 emission bands were investigated. The zonal wind velocity component along the line of sight is measured.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center The Nimbus 7 User's Guide; p 139-174
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  • 10
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    Far-infrared observations of sources associated with double-lobed reflection nebulae (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Far-infrared observations of GL 915, 618, 2688 and OH 0739-14 are presented. The data provide information on the total flux arising in each of these sources, and on the wavelength-dependence of the emissivity of the associated dust. Two sources, GL 618 and GL 2688, have far-infrared continua similar to those recently observed in planetary nebulae.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics; 65; 1, Ap; Apr. 197
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