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  • SPACE RADIATION  (4)
  • 1985-1989  (4)
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Year
  • 1
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    Gamma-ray line astrophysics (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Recent observations of gamma-ray line emission from solar flares, gamma-ray bursts, the galactic center, the interstellar medium and the jets of SS433 are reviewed. The implications of these observations on high energy processes in these sources are discussed.
    Keywords: SPACE RADIATION
    Type: Nineteenth International Cosmic Ray Conference. Conference Papers: Invited Rapporteur, Highlight, Miscellaneous, Volume 9; 23 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Transient X-rays, gamma-rays and neutrons in space (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The various astrophysical sources of transient X-ray, gamma-ray, and neutron emission which can produce significant increases in the high-energy (greater than 1 keV) radiation and particle background flux in space. These sources include solar flares, gamma-ray bursts, supernovae, and other astrophysical transients. The observations of these sources are reviewed, and the expected rate of occurrence of their transient emission is examined as a function of intensity and energy.
    Keywords: SPACE RADIATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Gamma ray burst size-frequency distributions: Spectral selection effects (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of spectral variation on the detection of gamma ray bursts were investigated. Selection biases resulting from these effects can account for the reported deviation of the observed size-frequency distribution in peak energy flux from that expected for a simple uniform distribution of sources. Thus these observations as yet provide no clear evidence for structure in the burst source distribution. Because of selection biases, the intrinsic average temperature of the bursts is much harder (kT approximately MeV) than the observed average (approximately 200 KeV).
    Keywords: SPACE RADIATION
    Type: OG-1.2-3 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 37-40; NASA-CP-2376-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Cosmic gamma-ray lines (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Recent observations of gamma-ray line emissions from gamma-ray bursts, the ISM, the Galactic center, and solar flares are reviewed, and the implications of these observations for high-energy processes in these sources are discussed. Line observations suggest that magnetized neutron stars are probably the best candidate objects for burst sources. Observations of the 1.809-MeV line from Al-26 decay provide evidence for ongoing nucleosynthesis in the Galaxy and information on the spatial distribution of nucleosynthetic sites. The compact 0.511-MeV line source is probably a black hole at or close to the Galactic center. Solar-flare studies have provided new information on the confinement and escape of charged particles at the sun and on multiple acceleration phases in solar flares.
    Keywords: SPACE RADIATION
    Type: Advances in Space Research (ISSN 0273-1177); 6; 4 19
    Format: text
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    NASA TECHNICAL REPORTS
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