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  • 1
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    Diffuse galactic annihilation radiation (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The study reports observations of positron annihilation radiation from the inner region of the Galaxy which show that there are two components of the radiation: a steady, diffuse Galactic component and a variable component from discrete, presumably compact sources. The existence of the variable component is supported by the ensemble of all narrow FOV 511 keV line observations, including recent detections with OSSE. The fit of this ensemble to a time-independent source distribution can be excluded at the approximately 3-sigma level. The same ensemble, combined with the broad FOV SMM observations of Galactic 511 keV line emission, sets constraints on the Galactic distribution of the diffuse component.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138); 97; 1; p. 127-131.
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  • 2
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    Hot spot and trench volcano separations (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It is suggested that the distribution of separations between trench volcanos located along subduction zones reflects the depth of partial melting, and that the separation distribution for hot spot volcanoes near spreading centers provides a measure of the depth of mantle convection cells. It is further proposed that the lateral dimensions of mantle convection cells are also represented by the hot-spot separations (rather than by ridge-trench distances) and that a break in the distribution of hot spot separations at 3000 km is evidence for both whole mantle convection and a deep thermal plume origin of hot spots.
    Keywords: GEOPHYSICS
    Type: Nature; 249; June 28
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  • 3
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    Power law time dependence of river flood decay and its relationship to long term discharge frequency distribution (1974)
    In:  Other Sources
    Details
    Publication Date: 2016-03-07
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: An Integrated Study of Earth Resources in the State of Calif. Using Remote Sensing Techn.; 11 p
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  • 4
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    Power law time dependence of river flood decay and its relationship to long term discharge frequency distribution (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Investigations have continued into the possibility that significant information on stream flow rates can be obtained from aerial and satellite imagery of river meander patterns by seeking a correlation between the meander and discharge spectra of rivers. Such a correlation could provide the basis for a simple and inexpensive technique for remote sensing of the water resources of large geographical areas, eliminating the need for much hydrologic recording. The investigation of the nature of the meander and discharge spectra and their interrelationship can also contribute to a more fundamental understanding of the processes of both river meander formation and drainage of large basins. It has been found that floods decay with an inverse power law dependence on time. The exponent of this dependence varies from river to river and even from station to station along the same river. This power law time dependence makes possible the forecasting of river discharge with an uncertainty of about 5% for as long as a month following the flood peak.
    Keywords: GEOPHYSICS
    Type: An Integrated Study of Earth Resources in the State of Calif. Using Remote Sensing Tech.; 11 p
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  • 5
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    Gamma-ray lines - A new window to the Universe (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Gamma-ray emission is considered in terms of its usefulness in determining the physics of nucleosynthesis, the interstellar medium, solar flares, supernovae, and neutron stars. The mechanism of gamma-ray line emission is reviewed, i.e., nuclear deexcitation, radiative capture, positron annihilation, and possibly cyclotron radiation in the strong magnetic fields of neutron stars. Various gamma-ray spectra, obtained from balloon and satellite data, are analyzed with attention to solar particle energies and densities, including particle emission from black-hole supernova remnants.
    Keywords: ASTROPHYSICS
    Type: Physics Today; 31; Mar. 197
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  • 6
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    River Meander Studies (1971)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: The feasibility of using satellite television photography of geomorphological indices to obtain a correlation between a stream meander power spectrum and stream discharge frequency distribution is considered. Water resources assessment includes information on the average rainfall over large drainage basins and calculations relating flow measurements to geographical areas. Photoelectric optical scanning techniques provide a digitized procedure for locating and following river meander curve points.
    Keywords: GEOPHYSICS
    Type: An Integrated Study of Earth Resources in the State of Calif. Using Remote Sensing Tech.; 6 p
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  • 7
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    River Meander Studies (1972)
    In:  CASI
    Details
    Publication Date: 2014-09-06
    Description: The meander patterns of the Feather and Colorado rivers were studied in an attempt to correlate pattern changes and flood probability. Attempts were also made to correlate stream meander power spectrum and stream discharge frequency distribution.
    Keywords: GEOPHYSICS
    Type: An Integrated Study of Earth Resources in the State of Calif. Using Remote Sensing Techniques; 26 p
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  • 8
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    Synchrotron cooling and annihilation of an e/+/-e/-/ plasma - The radiation mechanism for the 5 March, 1979 transient (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Positron-electron pair radiation is examined as a mechanism that could be responsible for the impulsive phase emission of the 5 March, 1979 transient. Synchrotron cooling and subsequent annihilation of the pairs can account for the energy spectrum, the very high brightness, and the 0.4 MeV feature observed from this transient, whose source is likely to be a neutron star in the supernova remnant N49 in the Large Magellanic Cloud. In this model, the observed radiation is produced in the skin layer of a hot, radiation-dominated pair atmosphere, probably confined to the vicinity of the neutron star by a strong magnetic field. In this layer, about 10 to the 12th generations of pairs are formed (by photon-photon collisions), cooled and annihilated during the 0.15 s duration of the impulsive phase.
    Keywords: ASTROPHYSICS
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  • 9
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    Origin of the 5 March 1979 gamma-ray transient - A vibrating neutron star (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An unusual gamma-ray transient was observed on 5 March 1979, with 12 different instruments on 9 different spacecraft. The source position of the 5 March transient, determined to an accuracy of 1 x 2 arcmin, is consistent with the direction of the supernova remnant N49 in the Large Magellanic Cloud (LMC). Subsequent analysis of the data, by narrowing the source error box to an area of about 6 by 30 arcsec inside the supernova remnant, considerably strengthens this identification. It is proposed that a vibrating neutron star in the LMC is the source of the 5 March transient. This may be both the first detection of a vibrating neutron star and indirect evidence for gravitation radiation.
    Keywords: ASTROPHYSICS
    Type: Nature; 287; Sept. 11
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  • 10
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    Supernova radio remnants and the filling factor of the hot interstellar medium (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: If a hot (temperature of about one-million K), tenuous gas fills about 90% of interstellar space, then the observed number and surface brightness distribution of galactic radio remnants implies a galactic supernova rate of once about every 30 years. This is consistent with estimates based on observations of historical supernovae, pulsars, and supernovae in other spiral galaxies.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 239
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