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  • 1
    Publication Date: 2013-08-31
    Description: Geosynchronous particle measurements are presented for comparison with same-scale plots of ISEE 3 plasma and field data. Shown for each day are electron and proton fluxes measured with the low-energy-range electron and the low-energy-range proton detectors of the Los Alamos Charged Particle Analyzer. This instrument has flown aboard several geosynchronous orbit satellites, including the three spacecraft from which the presented data were obtained. The presented data are 5-min averages of the integral flux in each of several energy channels.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-105038 , NSSDC/WDC-A-R/S-91-03-VOL-3 , NAS 1.15:105038
    Format: application/pdf
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  • 2
    Publication Date: 2011-08-19
    Description: The relationship between relativistic electron flux variations at 6.6 R(E) and various published indices and solar wind properties is studied. An attempt is made to characterize the temporal and dimensional relationships between solar wind or magnetic indices and electron flux enhancements. It is shown that the solar wind speed upstream of the earth's magnetosphere is correlated with large increases in the flux of highly relativistic electrons at geostationary orbit.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 15133-15
    Format: text
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  • 3
    Publication Date: 2011-08-19
    Description: Energy distribution functions have been derived from energetic (30-2000 keV) electron fluxes observed simultaneously by three geosynchronous orbit satellites throughout the year 1986. These distributions, as well as others derived from empirical models of outer magnetospheric electron fluxes, can be resolved into two distinct relativistic Maxwellian components which are each fully parameterized by a density and a temperature. A four-parameter characterization is presented which provides a new, simplified procedure for the interpretation of energetic electron data in the outer magnetosphere.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 16; 147-150
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  • 4
    Publication Date: 2011-08-19
    Description: The possibility of an internal magnetospheric acceleration mechanism as the source of relativistic electron fluxes in earth's outer magnetosphere is explored. Such a model includes the substorm generation of a spectrally soft electron component, with subsequent inward radial diffusion. At low L values, an outward transport of energetic electrons occurs which leads to a return of the accelerated population to the outer magnetosphere. Data obtained concurrently at geostationary orbit at three widely spaced local times during a relativistic electron event provide support for acceleration by a recirculation process.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 16; 559-562
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  • 5
    Publication Date: 2019-08-15
    Description: The highly energetic electron environment in the inner magnetosphere (GEO inward) has received a lot of research attention in resent years, as the dynamics of relativistic electron acceleration and transport are not yet fully understood. These electrons can cause deep dielectric charging in any space hardware in the MEO to GEO region. We use a new and novel approach to obtain a global representation of the inner magnetospheric energetic electron environment, which can reproduce the absolute environment (flux) for any spacecraft orbit in that region to within a factor of 2 for the energy range of 100 KeV to 5 MeV electrons, for any levels of magnetospheric activity. We combine the extensive set of inner magnetospheric energetic electron observations available at Los Alamos with the physics based Salammbo transport code, using the data assimilation technique of "nudging". This in effect input in-situ data into the code and allows the diffusion mechanisms in the code to interpolate the data into regions and times of no data availability. We present here details of the methods used, both in the data assimilation process and in the necessary inter-calibration of the input data used. We will present sample runs of the model/data code and compare the results to test spacecraft data not used in the data assimilation process.
    Keywords: Energy Production and Conversion
    Type: 8th Spacecraft Charging Technology Conference; NASA/CP-2004-213091
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