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  • GEOPHYSICS  (21,936)
  • 1
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    /U,B,K/ coordinates - A natural system for studying magnetospheric convection (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The formulation of the magnetospheric convection problem involves a coordinate system consisting of the electric potential, the magnetic field intensity, and the modified longitudinal invariant. The mapping is extended to include all particles and not just those mirroring in the magnetic equator. Equations of motion for the particle mirror points in this representation are presented. The analysis results in a natural division of the magnetosphere into accelerator and dynamo regions and use of the coordinate system permits trajectory-dependent effects to be distinguished from source- or sink-dependent effects. The representation is illustrated by application to the analysis of the nose structure protons observed by Smith and Hoffman (1974).
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Sept. 1
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  • 2
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    1 test and evaluation of ERTS-A data applications to a present status inventory of the post-1890 AD episode of accelerated erosion, and to monitoring future erosional changes, with specific reference to the Arizona regional ecological test site (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E72-10104 , NASA-CR-128153
    Format: application/pdf
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  • 3
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    15th order resonance terms using the decaying orbit of TETR-3 (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Fifteenth-order commensurability of the orbit of TETR-3 (1971-83B) is studied. The study is designed to obtain good discrimination of 15th-order resonances through a better range of inclinations. The first low inclination orbit, 33 deg, is used for this purpose; it is very sensitive to the high degree terms which were rather poorly represented by previously analyzed orbits.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 23; Mar. 197
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  • 4
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    17alpha/H/ hopane identified in oil shale of the Green River formation /Eocene/ by carbon-13 NMR. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: During an investigation of C-13 NMR shifts and the structural correspondence of pentacyclic triterpenes a C-13 NMR study was conducted on one of the most abundant components of the hexane soluble fraction of oil shale bitumen of the Green River formation. A rigorous proof was derived exclusively from C-13 NMR data for the structure of the important triterpenoid fossil molecule. It was established that the structure of the isolated triterpane was 17alpha(H) hopane.
    Keywords: GEOPHYSICS
    Type: Nature; 242; Apr. 27
    Format: text
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  • 5
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    18-months of UV irradiance observations from the Solar Mesosphere Explorer (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An instrument on the Solar Mesosphere Explorer has been making daily solar irradiance measurements in the 120-305 nm (UV) spectral interval since October 6, 1981. Calculations of the highest to lowest value of the irradiance within each solar rotation yield percent range values indicative of variations that are useful as input data for model calculations of stratosphere/mesosphere responses to short period solar variability, since solar radiation in the UV is largely responsible for the photochemical interactions and radiative heating of the stratosphere, mesosphere, and lower thermosphere.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 54-56
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  • 6
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    1960 Chile - New estimate of polar motion excitation (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A recent reanalysis of the International Latitude Serivce (ILS) polar motion data-day has been processed using Kalman filtering techniques to generate the polar motion excitation function over the time-span from 1960 to 1965. The resulting excitation function has been examined for the effects of 1960 Chile in an attempt to determine experimentally how large earthquake affect polar motion. The resulting upper bound of about 75 x 10 to the 22nd N-m for a 10-deg dip (about 36 x 10 to the 22nd N-m for 20-deg dip) is consistent with results obtained from previous seismic studies, including a recent normal mode excitation result. Following future great earthquakes, monitoring of polar motion by space-based techniques such as VLBI should continue at high temporal resolution for several weeks in order to directly measure the rheological parameters of the upper mantle.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 16; 1193-119
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  • 7
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    2-20 kev X-ray sky background (1969)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Spectral index for diffuse X ray sky background within specific band determined from rocket observations with wide angle telescope
    Keywords: GEOPHYSICS
    Type: ; 79, 82, 83 (
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  • 8
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    25 years of the impact-volcanic controversy - Is there anything new under the sun or inside the earth? (1990)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: The evidence for meteorite impact and internal volcanic processes (cryptovolcanism) as the cause of the K-T extinction and for cryptoexplosion structures is briefly reviewed. It is shown that numerous studies reinforce the view that shock-metamorphic features uniquely indicate shock pressure from 5 GPa to over 50 GPa, that no generally accepted shock-metamorphic features have been found in unquestioned volcanic structures, and that no internal process has been demonstrated to produce the required shock pressures. This history therefore supports an impact origin for both cryptoexplosion structures and the K-T event. Future discoveries required to make the cryptovolcanic theory a respectable alternative are discussed.
    Keywords: GEOPHYSICS
    Type: EOS (ISSN 0096-3941); 71; 411-414
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  • 9
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    3-D multilateration for measurement of earth crustal deformation and network densification (1973)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Discussion of how range and range-difference data types can make possible precise three-dimensional measurement of ground station positions and the position of an artificial signal source, without explicit dependence upon the signal source trajectory. An effective strategy for such measurement is to combine the multilateration approach with a VLBI system using natural radio sources. The VLBI methods would provide a coarse grid of three-dimensional benchmark locations on a regional and global scale. Multilateration stations would then occupy these coarse grid locations and provide a means for highly portable, relatively low-cost units to then densify networks on a regional and local scale. Because a multilateration approach can make use of strong artificial radio sources, it makes possible the use of relatively low-cost, highly mobile stations. Such mobile stations are virtually essential for three dimensional surveying in heavily urbanized areas or in rugged terrain.
    Keywords: GEOPHYSICS
    Type: Symposium on Earth''s Gravitational Field and Secular Variations in Position; Nov 26, 1973 - Nov 30, 1973; Sydney; Australia
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  • 10
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    3-dimensional current collection model (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A three-dimensional, time dependent current collection model of a satellite has been developed for the TSS-1 system. The system has been simulated particularly for the Research of Plasma Electrodynamics (ROPE) experiment. The Maxwellian distributed particles with the geomagnetic field effects are applied in this numerical simulation. The preliminary results indicate that a ring current is observed surrounding the satellite in the equatorial plane. This ring current is found between the plasma sheath and the satellite surface and is oscillating with a time scale of approximately 1 microsec. This is equivalent to the electron plasma frequency. An hour glass shape of electron distribution was observed when the viewing direction is perpendicular to the equatorial plane. This result is consistent with previous findings from Linson (1969) and Antoniades et al. (1990). Electrons that are absorbed by the satellite are limited from the background ionosphere as indicated by Parker and Murphy (1967).
    Keywords: GEOPHYSICS
    Type: AIAA PAPER 92-2988
    Format: text
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