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  • 1
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    NOAA's VENTS program targets oceanic hydrothermal effects (1991)
    In:  Eos, Trans., Am. Geophys. Un., Basel, Birkhäuser Verlag, vol. 72, no. 50, pp. 561-566, pp. B05S07, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1991
    Keywords: Geothermics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Tidal gravity and ocean tide loading in Europe (1991)
    In:  Geophys. J. Int., Washington D.C., Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 107, no. 1, pp. 1-11, pp. L09611
    Details
    Publication Date: 1991
    Keywords: TIDES ; Gravimetry, Gravitation ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Development of comprehensive seismic yield estimation system for underground nuclear explosions (1991)
    Phillips Laboratory Air Force Systems Command
    In:  scientific report, Hanscom Air Force Base, Phillips Laboratory Air Force Systems Command, vol. C 560, 183 pp., no. PL-TR-91-2161, pp. 1143-1146 (SL3.8), (ISBN 3-933346-037)
    Details
    Publication Date: 1991
    Keywords: Magnitude ; Energy (of earthquakes) ; Nuclear explosion ; Seismology ; Seismic arrays ; Data analysis / ~ processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Marine research using data from TOPEX/Poseidon (1991)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The Proudman Oceanographic Laboratory (POL), the Institute of Oceanographic Sciences Deacon Laboratory (IOSDL), and the British National Space Centre (BNSC) plan to use radar altimeter data from the TOPEX/POSEIDON mission in five main areas of research. These are: (1) investigation of variations in Southern Ocean sea levels and circulation; (2) related numerical modeling and data assimilation; (3) global and regional ocean tides; (4) North Sea and northeast Atlantic studies; and (5) winds and waves. Each one of these topics is described briefly below while more information can be extracted from the United Kingdom response to the TOPEX/POSEIDON Announcement of Opportunity.
    Keywords: OCEANOGRAPHY
    Type: JPL, TOPEX(Poseidon Science Investigations Plan; p 169-173
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    NASA TECHNICAL REPORTS
  • 5
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    Global Change Encyclopedia - A project for the international space year (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: 'Global Change Encyclopedia' is a project for the International Space Year in 1992. The project will produce a comprehensive set of satellite and other global data with relevance to studies of global change and of the earth as a system. These data will be packaged on CD-ROMs, accompanied by appropriate software for access, display and manipulation. On behalf of the Canadian Space Agency, the project is being carried out by the Canada Centre for Remote Sensing, with the U.S. National Oceanic and Atmospheric Administration and the U.S. National Aeronautics and Space Administration as major contributors. This paper highlights the background leading to the project, the concept and principal characteristics of the Encyclopedia itself, and the current status and plans.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: Advances in Space Research (ISSN 0273-1177); 11; 3, 19
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    NASA TECHNICAL REPORTS
  • 6
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    Ozone depletion in the high latitude lower stratosphere - 1979-1990 (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Archived Stratospheric Aerosol and Gas Experiment (SAGE, SAGE II) and Solar and Backscattered Ultraviolet (SBUV) data are used to examine lower stratospheric O3 variations at 50 deg latitude in both hemispheres. These data indicate that from 1979 to 1985, 73-90 percent of the total O3 changes have occurred below approximately 25 km in altitude. Significant O3 depletions (up to 15 percent) have occurred in the partial column (127-15.8 mbar) in both hemispheres with indications of a recovery after 1985. Two-dimensional model simulations of O3 changes from 1979 to 1990 have been carried out. Comparisons with O3 data are presented. Model results suggest that by 1985, significant declines in global O3 were caused by destruction by odd nitrogen associated with long-term variations in the flux of precipitating relativistic electrons (2.6 percent); solar UV flux changes (1.8 percent); the dilution effect associated with the Antarctic O3 hole (1.2 percent); and atmospheric increases in CH4, N2O, and chlorofluorocarbons (0.4 percent). Analyses of drift-corrected SBUV and Total Ozone Mapping Spectrometer data and model calculations indicate that between 1979 and 1985, reductions of 4.3 to 4.8 percent in total column O3 averaged between 65 deg S and 65 deg N have occurred. Calculations indicate a full global O3 decline of 5.2 percent (peak-to-peak) or 6 percent (annual average) between 1979 and 1985 with a partial recovery between 1985 and 1989.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 2921-293
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    NASA TECHNICAL REPORTS
  • 7
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    Linear prediction filters for linear and nonlinear modeled geomagnetic activity (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It is shown that the Faraday loop analog model of geomagnetic activity exhibits both the directly driven and loading-unloading magnetospheric responses to solar wind input. It is further shown that the directly driven component is a linear response to loading while the loading-unloading response is nonlinear. Linear prediction filters which relate model input to output are discussed. By either allowing or suppressing the loading-unloading model response filters that relate to nonlinear or linear dynamics, respectively, have been computed. Filters that described the directly driven response are finite ranged; they asymptote to zero with increasing lag on a time scale that is fixed by the dissipation rate of the model. Filters that describe the nonlinear total response are infinite ranged; they asymptote with increasing lag to large amplitude periodic oscillations. Some implications of these infinite ranged filters are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 18; 1635-163
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Rocket measurements of relativistic electrons - New features in fluxes, spectra and pitch angle distributions (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Novel features are presented of precipitating relativistic electron fluxes measured on a spinning sounding rocket payload at midday between altitudes of 70 and 130 km in the auroral region. The sounding rocket was launched during a relativistic electron enhancement event of modest intensity. Electron fluxes were measured for a total of about 210 seconds at energies from 0.1 to 3.8 MeV, while pitch angle was sampled from 0 to 90 deg every spin cycle. Electrons with energies below about 0.2 MeV showed isotropic pitch angle distributions during most of the first 90 sec of data, while at higher energies the electrons had the highest fluxes near the mirroring angle (90 deg); when they occurred, the noted downward bursts were seen at all energies. The low-altitude fluxes are compared with those measured at geostationary orbit, and it is found that the low-altitude fluxes are much higher than expected from a simple mapping of a pancake distribution at high altitudes.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 18; 1481-148
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    NASA TECHNICAL REPORTS
  • 9
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    The transient gamma-ray spectrometer (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The authors describe the Transient Gamma-Ray Spectrometer (TGRS) to be flown onboard the WIND spacecraft. This instrument is designed to detect cosmic gamma-ray bursts over the energy range of 20 keV to 10 MeV with an expected spectroscopic resolution of 2 keV at 1 MeV (E/Delta-E = 500). The active detection element is a 215-cu cm high-purity n-type Ge crystal cooled to cryogenic temperatures by a passive radiative cooler. The geometric field of view (FOV) defined by the cooler is 170 deg FWFM. Burst data are stored directly in an onboard 2.75-Mb burst memory with an absolute timing accuracy of +/-1.5 ms. This capacity is sufficient to store the entire spectral data set of all but the largest bursts. In addition to burst measurements, the instrument will also study solar flares, search for possible diffuse background lines, and monitor the 511-keV positron annihilation radiation from the galactic center. The experiment is scheduled to be launched on a Delta II launch vehicle from Cape Canaveral on December 31, 1992.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 38; 559-567
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A numerical study of thunderstorm electrification - Model development and case study (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A numerical model was developed for examining the thunderstorm electrification process in which it is assumed that the electrification is entirely due to noninductive charge transfer between colliding ice crystals and hail. Since this ice-hail charge mechanism is very dependent on particle sizes and distributions, an explicit microphysical framework is used. To maintain simplicity, the electrification model is kinematic; thus the temperature and velocity fields are input into the electrification model. The cloud model of Taylor (1989) was used to generate the temperature and velocity fields to examine the July 19, 1981, Cooperative Convective Precipitation Experiment thundercloud. Using these fields, the electrification model produced time-dependent ice particle concentrations, radar reflectivities, charge, and vertical electric field distributions in good general agreement with those observed. The model produced a maximum electric field strength of 1.27 kV/cm, which is on the order of that needed for lightning initiation, and this maximum occurred very close to the time of the observed discharge. Thus, the ice-hail charge mechanism appears to have played an important role in the electrical development of the July 19 cloud.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 96; 7463-748
    Format: text
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    NASA TECHNICAL REPORTS
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