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  • GEOPHYSICS  (11)
  • 1980-1984  (11)
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Year
  • 1
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    The variability of stratospheric and mesospheric NO2 in the polar winter night observed by LIMS (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The LIMS experiment sounded the upper atmosphere from late October 1978 to late May 1979 and provided vertical profiles of atmospheric temperature, 03, H2O, HNO3, and NO2. Radiance averaging was used before retrieval to measure the altitude distribution of NO2 over the altitude range from the lower stratosphere into the mesosphere. Observations in the polar winter night region northward of about 70 deg N reveal NO2 levels near 175 ppbv at about 70 km, and they show a significant longitudinal variability (factor of 4 to 7). A definite temporal trend exists, showing a buildup of mesospheric and stratospheric NO2 during the polar night and a subsequent slowing of the increase of decline after sunlight returns, depending on altitude. The data represent the first experimental evidence that the thermosphere is an NO(x) source for the mesosphere and stratosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 7267-727
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The effect of particle precipitation events on the neutral and ion chemistry of the middle atmosphere. II - Odd hydrogen (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A one dimensional time-dependent model of the neutral and ion chemistry of the middle atmosphere has been used to examine the production of odd hydrogen (H, OH, and HO2) during charged particle precipitation. At altitudes above about 65 km, odd hydrogen production depends on the ionization rate, and the atomic oxygen and water vapor densities. Odd hydrogen production is shown to exhibit diurnal and other time dependent variations during such an event at these altitudes, and the assumption that two odd hydrogen particles are always produced per ionization is reexamined.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 29; Aug. 198
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  • 3
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    The effect of particle precipitation events on the neutral and ion chemistry of the middle atmosphere. I - Odd nitrogen (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 29; July 198
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  • 4
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    Tectonic stress - Models and magnitudes (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is shown that global data on directions of principal stresses in plate interiors can serve as a test of possible plate tectonic force models. Such tests performed to date favor force models in which ridge pushing forces play a significant role. For such models the general magnitude of regional deviatoric stresses is comparable to the 200-300 bar compressive stress exerted by spreading ridges. An alternative approach to estimating magnitudes of regional deviatoric stresses from stress orientations is to seek regions of local stress either demonstrably smaller than or larger than the regional stresses. The regional stresses in oceanic intraplate regions are larger than the 100-bar compression exerted by the Ninetyeast Ridge and less than the bending stresses (not less than 1 kbar) beneath Hawaii.
    Keywords: GEOPHYSICS
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  • 5
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    The OI 989-A tropical nightglow (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Attention is given to the morphology and origin of the OI 989 A emission in the tropical nightglow. Dielectronic recombination of O(+) is suggested as the mechanism responsible for populating the 3s' 3D0 state of this 2p4 3P 3s' 3D0 emission. The spectrometer used is that aboard the STP 78-1 satellite, which is in sun-synchronous orbit. The emission morphology is characterized by tropical arcs on each side of the dip equator.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 569-571
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  • 6
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    Tomographic inversion of satellite photometry (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An inversion algorithm capable of reconstructing the volume emission rate of thermospheric airglow features from satellite photometry has been developed. The accuracy and resolution of this technique are investigated using simulated data, and the inversions of several sets of observations taken by the Visible Airglow Experiment are presented.
    Keywords: GEOPHYSICS
    Type: Applied Optics (ISSN 0003-6935); 23; 3409-341
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  • 7
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    Source mechanisms of earthquakes near mid-ocean ridges from body waveform inversion - Implications for the early evolution of oceanic lithosphere (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An evaluation is presented of the tectonics of the near-ridge environment based on the source mechanisms of earthquakes in young oceanic lithosphere. A catalog of near-ridge earthquakes is presented, and source parameters are determined from body waveform inversions. Source parameter-age relations are examined, and the near-ridge seismicity of the Indian Ocean is discussed. Deep normal faulting in young oceanic lithosphere is addressed, as is the relationship between thermoelastic stress and near-ridge earthquakes. The possibility of secondary convection beneath young oceanic lithosphere is considered. Finally, the broader tectonic implications of these results for the evolution of young oceanic lithosphere are discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 11415-11
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  • 8
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    An extensive region of off-ridge normal-faulting earthquakes in the southern Indian Ocean (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A verified prediction of the theory of plate tectonics is that the focal mechanisms of earthquakes on the mid-ocean ridge system indicate either normal faulting on ridge segments or strike-slip faulting on transform faults. A broad region in the southern Indian Ocean which differs from typical ridge and intraplate regimes has been identified. In this region a number of large off-ridge earthquakes have occurred in the last 20 years. The mechanisms for these events, where known, all involve normal faulting. Nine of these earthquakes have been studied in detail using a formal inversion technique based on matching synthetic body waves to observed seismograms.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 2425-244
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  • 9
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    Application of Laser Ranging and VLBI Data to a Study of Plate Tectonic Driving Forces (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The conditions under which changes in plate driving or resistive forces associated with plate boundary earthquakes are measurable with laser ranging or very long base interferometry were investigated. Aspects of plate forces that can be characterized by such measurements were identified. Analytic solutions for two dimensional stress diffusion in a viscoelastic plate following earthquake faulting on a finite fault, finite element solutions for three dimensional stress diffusion in a viscoelastic Earth following earthquake faulting, and quantitative constraints from modeling of global intraplate stress on the magnitude of deviatoric stress in the lithosphere are among the topics discussed.
    Keywords: GEOPHYSICS
    Type: NASA-CR-163019 , Conf. on the Magnitude of Deviatoric Stresses in the Earth''s Crust and Upper Mantle; Jul 29, 1979 - Aug 02, 1979; Carmel, CA; United States
    Format: application/pdf
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  • 10
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    LRIR observations of diurnal ozone variation in the mesosphere (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Limb Radiance Inversion Radiometer (LRIR) on the Nimbus 6 spacecraft obtained measurements of atmospheric infrared emission from which vertical profiles of temperature and ozone mixing ratio can be deduced. A three day sequence of data on either side of the evening terminator has been analyzed as a function of solar zenith angle (35 deg to 105 deg) and pressure level (2 mb to .1 mb). The response of the ozone field to solar flux extinction, temperature variability, and nighttime recombination are readily detected.
    Keywords: GEOPHYSICS
    Type: In: Quadrennial International Ozone Symposium; Aug 04, 1980 - Aug 09, 1980; Boulder, CO
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